android_translation_layer/src/api-impl/android/view/View.java

package android.view;

import android.R;
import android.animation.StateListAnimator;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.LayoutDirection;
import android.util.Slog;
import android.util.SparseArray;
import android.view.animation.Animation;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;

public class View extends Object {

	// --- constants from android source

	/**
	 * The logging tag used by this class with android.util.Log.
	 */
	protected static final String TAG = "View";

	/**
	 * When set to true, apps will draw debugging information about their layouts.
	 *
	 * @hide
	 */
	public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout";

	/**
	 * Used to mark a View that has no ID.
	 */
	public static final int NO_ID = -1;

	/**
	 * Signals that compatibility booleans have been initialized according to
	 * target SDK versions.
	 */
	private static boolean sCompatibilityDone = false;

	/**
	 * Use the old (broken) way of building MeasureSpecs.
	 */
	private static boolean sUseBrokenMakeMeasureSpec = false;

	/**
	 * Ignore any optimizations using the measure cache.
	 */
	private static boolean sIgnoreMeasureCache = false;

	/**
	 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when
	 * calling setFlags.
	 */
	private static final int NOT_FOCUSABLE = 0x00000000;

	/**
	 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling
	 * setFlags.
	 */
	private static final int FOCUSABLE = 0x00000001;

	/**
	 * Mask for use with setFlags indicating bits used for focus.
	 */
	private static final int FOCUSABLE_MASK = 0x00000001;

	/**
	 * This view will adjust its padding to fit sytem windows (e.g. status bar)
	 */
	private static final int FITS_SYSTEM_WINDOWS = 0x00000002;

	/**
	 * This view is visible.
	 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
	 * android:visibility}.
	 */
	public static final int VISIBLE = 0x00000000;

	/**
	 * This view is invisible, but it still takes up space for layout purposes.
	 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
	 * android:visibility}.
	 */
	public static final int INVISIBLE = 0x00000004;

	/**
	 * This view is invisible, and it doesn't take any space for layout
	 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
	 * android:visibility}.
	 */
	public static final int GONE = 0x00000008;

	/**
	 * Mask for use with setFlags indicating bits used for visibility.
	 * {@hide}
	 */
	static final int VISIBILITY_MASK = 0x0000000C;

	private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE};

	/**
	 * This view is enabled. Interpretation varies by subclass.
	 * Use with ENABLED_MASK when calling setFlags.
	 * {@hide}
	 */
	static final int ENABLED = 0x00000000;

	/**
	 * This view is disabled. Interpretation varies by subclass.
	 * Use with ENABLED_MASK when calling setFlags.
	 * {@hide}
	 */
	static final int DISABLED = 0x00000020;

	/**
	 * Mask for use with setFlags indicating bits used for indicating whether
	 * this view is enabled
	 * {@hide}
	 */
	static final int ENABLED_MASK = 0x00000020;

	/**
	 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be
	 * called and further optimizations will be performed. It is okay to have
	 * this flag set and a background. Use with DRAW_MASK when calling setFlags.
	 * {@hide}
	 */
	static final int WILL_NOT_DRAW = 0x00000080;

	/**
	 * Mask for use with setFlags indicating bits used for indicating whether
	 * this view is will draw
	 * {@hide}
	 */
	static final int DRAW_MASK = 0x00000080;

	/**
	 * <p>This view doesn't show scrollbars.</p>
	 * {@hide}
	 */
	static final int SCROLLBARS_NONE = 0x00000000;

	/**
	 * <p>This view shows horizontal scrollbars.</p>
	 * {@hide}
	 */
	static final int SCROLLBARS_HORIZONTAL = 0x00000100;

	/**
	 * <p>This view shows vertical scrollbars.</p>
	 * {@hide}
	 */
	static final int SCROLLBARS_VERTICAL = 0x00000200;

	/**
	 * <p>Mask for use with setFlags indicating bits used for indicating which
	 * scrollbars are enabled.</p>
	 * {@hide}
	 */
	static final int SCROLLBARS_MASK = 0x00000300;

	/**
	 * Indicates that the view should filter touches when its window is obscured.
	 * Refer to the class comments for more information about this security feature.
	 * {@hide}
	 */
	static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400;

	/**
	 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate
	 * that they are optional and should be skipped if the window has
	 * requested system UI flags that ignore those insets for layout.
	 */
	static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800;

	/**
	 * <p>This view doesn't show fading edges.</p>
	 * {@hide}
	 */
	static final int FADING_EDGE_NONE = 0x00000000;

	/**
	 * <p>This view shows horizontal fading edges.</p>
	 * {@hide}
	 */
	static final int FADING_EDGE_HORIZONTAL = 0x00001000;

	/**
	 * <p>This view shows vertical fading edges.</p>
	 * {@hide}
	 */
	static final int FADING_EDGE_VERTICAL = 0x00002000;

	/**
	 * <p>Mask for use with setFlags indicating bits used for indicating which
	 * fading edges are enabled.</p>
	 * {@hide}
	 */
	static final int FADING_EDGE_MASK = 0x00003000;

	/**
	 * <p>Indicates this view can be clicked. When clickable, a View reacts
	 * to clicks by notifying the OnClickListener.<p>
	 * {@hide}
	 */
	static final int CLICKABLE = 0x00004000;

	/**
	 * <p>Indicates this view is caching its drawing into a bitmap.</p>
	 * {@hide}
	 */
	static final int DRAWING_CACHE_ENABLED = 0x00008000;

	/**
	 * <p>Indicates that no icicle should be saved for this view.<p>
	 * {@hide}
	 */
	static final int SAVE_DISABLED = 0x000010000;

	/**
	 * <p>Mask for use with setFlags indicating bits used for the saveEnabled
	 * property.</p>
	 * {@hide}
	 */
	static final int SAVE_DISABLED_MASK = 0x000010000;

	/**
	 * <p>Indicates that no drawing cache should ever be created for this view.<p>
	 * {@hide}
	 */
	static final int WILL_NOT_CACHE_DRAWING = 0x000020000;

	/**
	 * <p>Indicates this view can take / keep focus when int touch mode.</p>
	 * {@hide}
	 */
	static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000;

	/**
	 * <p>Enables low quality mode for the drawing cache.</p>
	 */
	public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000;

	/**
	 * <p>Enables high quality mode for the drawing cache.</p>
	 */
	public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000;

	/**
	 * <p>Enables automatic quality mode for the drawing cache.</p>
	 */
	public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000;

	private static final int[] DRAWING_CACHE_QUALITY_FLAGS = {
	    DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH};

	/**
	 * <p>Mask for use with setFlags indicating bits used for the cache
	 * quality property.</p>
	 * {@hide}
	 */
	static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000;

	/**
	 * <p>
	 * Indicates this view can be long clicked. When long clickable, a View
	 * reacts to long clicks by notifying the OnLongClickListener or showing a
	 * context menu.
	 * </p>
	 * {@hide}
	 */
	static final int LONG_CLICKABLE = 0x00200000;

	/**
	 * <p>Indicates that this view gets its drawable states from its direct parent
	 * and ignores its original internal states.</p>
	 *
	 * @hide
	 */
	static final int DUPLICATE_PARENT_STATE = 0x00400000;

	/**
	 * The scrollbar style to display the scrollbars inside the content area,
	 * without increasing the padding. The scrollbars will be overlaid with
	 * translucency on the view's content.
	 */
	public static final int SCROLLBARS_INSIDE_OVERLAY = 0;

	/**
	 * The scrollbar style to display the scrollbars inside the padded area,
	 * increasing the padding of the view. The scrollbars will not overlap the
	 * content area of the view.
	 */
	public static final int SCROLLBARS_INSIDE_INSET = 0x01000000;

	/**
	 * The scrollbar style to display the scrollbars at the edge of the view,
	 * without increasing the padding. The scrollbars will be overlaid with
	 * translucency.
	 */
	public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000;

	/**
	 * The scrollbar style to display the scrollbars at the edge of the view,
	 * increasing the padding of the view. The scrollbars will only overlap the
	 * background, if any.
	 */
	public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000;

	/**
	 * Mask to check if the scrollbar style is overlay or inset.
	 * {@hide}
	 */
	static final int SCROLLBARS_INSET_MASK = 0x01000000;

	/**
	 * Mask to check if the scrollbar style is inside or outside.
	 * {@hide}
	 */
	static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000;

	/**
	 * Mask for scrollbar style.
	 * {@hide}
	 */
	static final int SCROLLBARS_STYLE_MASK = 0x03000000;

	/**
	 * View flag indicating that the screen should remain on while the
	 * window containing this view is visible to the user.  This effectively
	 * takes care of automatically setting the WindowManager's
	 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}.
	 */
	public static final int KEEP_SCREEN_ON = 0x04000000;

	/**
	 * View flag indicating whether this view should have sound effects enabled
	 * for events such as clicking and touching.
	 */
	public static final int SOUND_EFFECTS_ENABLED = 0x08000000;

	/**
	 * View flag indicating whether this view should have haptic feedback
	 * enabled for events such as long presses.
	 */
	public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000;

	/**
	 * <p>Indicates that the view hierarchy should stop saving state when
	 * it reaches this view.  If state saving is initiated immediately at
	 * the view, it will be allowed.
	 * {@hide}
	 */
	static final int PARENT_SAVE_DISABLED = 0x20000000;

	/**
	 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p>
	 * {@hide}
	 */
	static final int PARENT_SAVE_DISABLED_MASK = 0x20000000;

	/**
	 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)}
	 * should add all focusable Views regardless if they are focusable in touch mode.
	 */
	public static final int FOCUSABLES_ALL = 0x00000000;

	/**
	 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)}
	 * should add only Views focusable in touch mode.
	 */
	public static final int FOCUSABLES_TOUCH_MODE = 0x00000001;

	/**
	 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable
	 * item.
	 */
	public static final int FOCUS_BACKWARD = 0x00000001;

	/**
	 * Use with {@link #focusSearch(int)}. Move focus to the next selectable
	 * item.
	 */
	public static final int FOCUS_FORWARD = 0x00000002;

	/**
	 * Use with {@link #focusSearch(int)}. Move focus to the left.
	 */
	public static final int FOCUS_LEFT = 0x00000011;

	/**
	 * Use with {@link #focusSearch(int)}. Move focus up.
	 */
	public static final int FOCUS_UP = 0x00000021;

	/**
	 * Use with {@link #focusSearch(int)}. Move focus to the right.
	 */
	public static final int FOCUS_RIGHT = 0x00000042;

	/**
	 * Use with {@link #focusSearch(int)}. Move focus down.
	 */
	public static final int FOCUS_DOWN = 0x00000082;

	/**
	 * Bits of {@link #getMeasuredWidthAndState()} and
	 * {@link #getMeasuredWidthAndState()} that provide the actual measured size.
	 */
	public static final int MEASURED_SIZE_MASK = 0x00ffffff;

	/**
	 * Bits of {@link #getMeasuredWidthAndState()} and
	 * {@link #getMeasuredWidthAndState()} that provide the additional state bits.
	 */
	public static final int MEASURED_STATE_MASK = 0xff000000;

	/**
	 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits
	 * for functions that combine both width and height into a single int,
	 * such as {@link #getMeasuredState()} and the childState argument of
	 * {@link #resolveSizeAndState(int, int, int)}.
	 */
	public static final int MEASURED_HEIGHT_STATE_SHIFT = 16;

	/**
	 * Bit of {@link #getMeasuredWidthAndState()} and
	 * {@link #getMeasuredWidthAndState()} that indicates the measured size
	 * is smaller that the space the view would like to have.
	 */
	public static final int MEASURED_STATE_TOO_SMALL = 0x01000000;

	// --- and some flags

	/**
	 * Indicates that this view has reported that it can accept the current drag's content.
	 * Cleared when the drag operation concludes.
	 * @hide
	 */
	static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001;

	/**
	 * Indicates that this view is currently directly under the drag location in a
	 * drag-and-drop operation involving content that it can accept.  Cleared when
	 * the drag exits the view, or when the drag operation concludes.
	 * @hide
	 */
	static final int PFLAG2_DRAG_HOVERED = 0x00000002;

	/**
	 * Horizontal layout direction of this view is from Left to Right.
	 * Use with {@link #setLayoutDirection}.
	 */
	public static final int LAYOUT_DIRECTION_LTR = LayoutDirection.LTR;

	/**
	 * Horizontal layout direction of this view is from Right to Left.
	 * Use with {@link #setLayoutDirection}.
	 */
	public static final int LAYOUT_DIRECTION_RTL = LayoutDirection.RTL;

	/**
	 * Horizontal layout direction of this view is inherited from its parent.
	 * Use with {@link #setLayoutDirection}.
	 */
	public static final int LAYOUT_DIRECTION_INHERIT = LayoutDirection.INHERIT;

	/**
	 * Horizontal layout direction of this view is from deduced from the default language
	 * script for the locale. Use with {@link #setLayoutDirection}.
	 */
	public static final int LAYOUT_DIRECTION_LOCALE = LayoutDirection.LOCALE;

	/**
	 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED)
	 * @hide
	 */
	static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2;

	/**
	 * Mask for use with private flags indicating bits used for horizontal layout direction.
	 * @hide
	 */
	static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;

	/**
	 * Indicates whether the view horizontal layout direction has been resolved and drawn to the
	 * right-to-left direction.
	 * @hide
	 */
	static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;

	/**
	 * Indicates whether the view horizontal layout direction has been resolved.
	 * @hide
	 */
	static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;

	/**
	 * Mask for use with private flags indicating bits used for resolved horizontal layout direction.
	 * @hide
	 */
	static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;

	// --- apparently there's more...

	@Deprecated public static final int STATUS_BAR_HIDDEN = 1; // 0x1

	@Deprecated public static final int STATUS_BAR_VISIBLE = 0; // 0x0

	public static final int SYSTEM_UI_FLAG_FULLSCREEN = 4; // 0x4

	public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 2; // 0x2

	public static final int SYSTEM_UI_FLAG_IMMERSIVE = 2048; // 0x800

	public static final int SYSTEM_UI_FLAG_IMMERSIVE_STICKY = 4096; // 0x1000

	public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 1024; // 0x400

	public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 512; // 0x200

	public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 256; // 0x100

	public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 1; // 0x1

	public static final int SYSTEM_UI_FLAG_VISIBLE = 0; // 0x0

	public static final int SYSTEM_UI_LAYOUT_FLAGS = 1536; // 0x600

	public static final int TEXT_ALIGNMENT_CENTER = 4; // 0x4

	public static final int TEXT_ALIGNMENT_GRAVITY = 1; // 0x1

	public static final int TEXT_ALIGNMENT_INHERIT = 0; // 0x0

	public static final int TEXT_ALIGNMENT_TEXT_END = 3; // 0x3

	public static final int TEXT_ALIGNMENT_TEXT_START = 2; // 0x2

	public static final int TEXT_ALIGNMENT_VIEW_END = 6; // 0x6

	public static final int TEXT_ALIGNMENT_VIEW_START = 5; // 0x5

	public static final int TEXT_DIRECTION_ANY_RTL = 2; // 0x2

	public static final int TEXT_DIRECTION_FIRST_STRONG = 1; // 0x1

	public static final int TEXT_DIRECTION_INHERIT = 0; // 0x0

	public static final int TEXT_DIRECTION_LOCALE = 5; // 0x5

	public static final int TEXT_DIRECTION_LTR = 3; // 0x3

	public static final int TEXT_DIRECTION_RTL = 4; // 0x4

	// --- end of constants from android source

	// --- interfaces from android source
	public interface OnTouchListener {
		/**
		 * Called when a touch event is dispatched to a view. This allows listeners to
		 * get a chance to respond before the target view.
		 *
		 * @param v The view the touch event has been dispatched to.
		 * @param event The MotionEvent object containing full information about
		 *        the event.
		 * @return True if the listener has consumed the event, false otherwise.
		 */
		boolean onTouch(View v, MotionEvent event);
	}

	public interface OnClickListener {
		void onClick(View v);
	}

	public interface OnAttachStateChangeListener {
		// TODO
	}

	public interface OnGenericMotionListener {
		// TODO
	}

	public interface OnSystemUiVisibilityChangeListener {
		// TODO
	}

	public static interface OnKeyListener {
		// TODO
		//		boolean onKey(View v, int keyCode, KeyEvent event);
	}

	public interface OnLongClickListener {
		// TODO
	}

	public interface OnHoverListener {
		// TODO
	}

	public interface OnApplyWindowInsetsListener {
		// TODO
	}

	public interface OnLayoutChangeListener {
		// TODO
	}

	public interface OnUnhandledKeyEventListener {
		// TODO
	}

	public interface OnFocusChangeListener {
		// TODO
	}

	public interface OnCreateContextMenuListener {
		/**
		 * Called when the context menu for this view is being built. It is not
		 * safe to hold onto the menu after this method returns.
		 *
		 * @param menu The context menu that is being built
		 * @param v The view for which the context menu is being built
		 * @param menuInfo Extra information about the item for which the
		 *            context menu should be shown. This information will vary
		 *            depending on the class of v.
		 */
//		void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo);
	}
	// --- end of interfaces

	// --- subclasses

	/**
	 * A MeasureSpec encapsulates the layout requirements passed from parent to child.
	 * Each MeasureSpec represents a requirement for either the width or the height.
	 * A MeasureSpec is comprised of a size and a mode. There are three possible
	 * modes:
	 * <dl>
	 * <dt>UNSPECIFIED</dt>
	 * <dd>
	 * The parent has not imposed any constraint on the child. It can be whatever size
	 * it wants.
	 * </dd>
	 *
	 * <dt>EXACTLY</dt>
	 * <dd>
	 * The parent has determined an exact size for the child. The child is going to be
	 * given those bounds regardless of how big it wants to be.
	 * </dd>
	 *
	 * <dt>AT_MOST</dt>
	 * <dd>
	 * The child can be as large as it wants up to the specified size.
	 * </dd>
	 * </dl>
	 *
	 * MeasureSpecs are implemented as ints to reduce object allocation. This class
	 * is provided to pack and unpack the &lt;size, mode&gt; tuple into the int.
	 */
	public static class MeasureSpec {
		private static final int MODE_SHIFT = 30;
		private static final int MODE_MASK = 0x3 << MODE_SHIFT;

		/**
		 * Measure specification mode: The parent has not imposed any constraint
		 * on the child. It can be whatever size it wants.
		 */
		public static final int UNSPECIFIED = 0 << MODE_SHIFT;

		/**
		 * Measure specification mode: The parent has determined an exact size
		 * for the child. The child is going to be given those bounds regardless
		 * of how big it wants to be.
		 */
		public static final int EXACTLY = 1 << MODE_SHIFT;

		/**
		 * Measure specification mode: The child can be as large as it wants up
		 * to the specified size.
		 */
		public static final int AT_MOST = 2 << MODE_SHIFT;

		/**
		 * Creates a measure specification based on the supplied size and mode.
		 *
		 * The mode must always be one of the following:
		 * <ul>
		 *  <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li>
		 *  <li>{@link android.view.View.MeasureSpec#EXACTLY}</li>
		 *  <li>{@link android.view.View.MeasureSpec#AT_MOST}</li>
		 * </ul>
		 *
		 * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's
		 * implementation was such that the order of arguments did not matter
		 * and overflow in either value could impact the resulting MeasureSpec.
		 * {@link android.widget.RelativeLayout} was affected by this bug.
		 * Apps targeting API levels greater than 17 will get the fixed, more strict
		 * behavior.</p>
		 *
		 * @param size the size of the measure specification
		 * @param mode the mode of the measure specification
		 * @return the measure specification based on size and mode
		 */
		public static int makeMeasureSpec(int size, int mode) {
			if (sUseBrokenMakeMeasureSpec) {
				return size + mode;
			} else {
				return (size & ~MODE_MASK) | (mode & MODE_MASK);
			}
		}

		/**
		 * Extracts the mode from the supplied measure specification.
		 *
		 * @param measureSpec the measure specification to extract the mode from
		 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED},
		 *		 {@link android.view.View.MeasureSpec#AT_MOST} or
		 *		 {@link android.view.View.MeasureSpec#EXACTLY}
		 */
		public static int getMode(int measureSpec) {
			return (measureSpec & MODE_MASK);
		}

		/**
		 * Extracts the size from the supplied measure specification.
		 *
		 * @param measureSpec the measure specification to extract the size from
		 * @return the size in pixels defined in the supplied measure specification
		 */
		public static int getSize(int measureSpec) {
			return (measureSpec & ~MODE_MASK);
		}

		static int adjust(int measureSpec, int delta) {
			return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec));
		}

		/**
		 * Returns a String representation of the specified measure
		 * specification.
		 *
		 * @param measureSpec the measure specification to convert to a String
		 * @return a String with the following format: "MeasureSpec: MODE SIZE"
		 */
		public static String toString(int measureSpec) {
			int mode = getMode(measureSpec);
			int size = getSize(measureSpec);

			StringBuilder sb = new StringBuilder("MeasureSpec: ");

			if (mode == UNSPECIFIED)
				sb.append("UNSPECIFIED ");
			else if (mode == EXACTLY)
				sb.append("EXACTLY ");
			else if (mode == AT_MOST)
				sb.append("AT_MOST ");
			else
				sb.append(mode).append(" ");

			sb.append(size);
			return sb.toString();
		}
	}

	// --- end of subclasses

	public int id = NO_ID;
	private int system_ui_visibility = 0;
	public ViewGroup parent;
	public AttributeSet attrs;
	protected ViewGroup.LayoutParams layout_params;
	private Context context;
	private Map<Integer,Object> tags = new HashMap<>();
	private Object tag;
	int gravity = -1;  // fallback gravity for layout childs

	int measuredWidth = 0;
	int measuredHeight = 0;

	private int left;
	private int top;
	private int right;
	private int bottom;

	private int scrollX = 0;
	private int scrollY = 0;

	private boolean attachedToWindow = false;

	public long widget; // pointer

	public static HashMap<Integer, View> view_by_id = new HashMap<Integer, View>();

	private int oldWidthMeasureSpec = -1;
	private int oldHeightMeasureSpec = -1;
	private boolean layoutRequested = true;
	private int oldWidth;
	private int oldHeight;
	private boolean haveCustomMeasure;
	protected boolean haveComplexMeasure = false;

	private int visibility = View.VISIBLE;
	private float alpha = 1.0f;
	private boolean pressed = false;
	private Drawable background;

	public View(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public View(Context context, AttributeSet attrs, int defStyle) {
		this.context = context;

		widget = native_constructor(context, attrs);

		if (attrs != null) {
			int id = attrs.getAttributeResourceValue("http://schemas.android.com/apk/res/android", "id", 0);
			if (id != 0) {
				this.id = id;
				view_by_id.put(id, this);
			}


			TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, defStyle, 0);
			if (a.hasValue(com.android.internal.R.styleable.View_background)) {
				int background = a.getResourceId(com.android.internal.R.styleable.View_background, 0);

				if(background != 0) {
					if(context.getResources().getResourceTypeName(background).equals("color")) {// drawables not currently supported
						System.out.printf("__background__: >%x<\n", context.getResources().getColor(background));

						final android.util.TypedValue typedValue = new android.util.TypedValue();

						setBackgroundColor(context.getResources().getColor(background));
					}
				}
			}
		}
	}

	public View findViewById(int id) {
		/* TODO: this should probably only search among children, but the id is surely unique anyway? :P */
		return view_by_id.get(id);
	}

	public void onDraw(Canvas canvas) {}

	public View(Context context) {
		this(context, null);
	}

	public final ViewParent getParent() {
		return parent;
	}

	public void setLayoutParams(ViewGroup.LayoutParams params) {
		if (params == null) {
			throw new NullPointerException("Layout parameters cannot be null");
		}

		int gravity = params.gravity;
		if (gravity == -1 && parent != null)
			gravity = parent.gravity;

		int leftMargin = 0;
		int topMargin = 0;
		int rightMargin = 0;
		int bottomMargin = 0;
		if (params instanceof ViewGroup.MarginLayoutParams) {
			leftMargin = ((ViewGroup.MarginLayoutParams) params).leftMargin;
			topMargin = ((ViewGroup.MarginLayoutParams) params).topMargin;
			rightMargin = ((ViewGroup.MarginLayoutParams) params).rightMargin;
			bottomMargin = ((ViewGroup.MarginLayoutParams) params).bottomMargin;
		}

		native_setLayoutParams(widget, params.width, params.height, gravity, params.weight, leftMargin, topMargin, rightMargin, bottomMargin);

		layout_params = params;
	}

	public ViewGroup.LayoutParams getLayoutParams() {
		return layout_params;
	}

	protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) {
		this.measuredWidth = measuredWidth;
		this.measuredHeight = measuredHeight;
	}

	public Resources getResources() {
		return Context.this_application.getResources();
	}

	public void setGravity(int gravity) {
		this.gravity = gravity;
	}

	public boolean onTouchEvent(MotionEvent event) {
		return false;
	}

	public native void setOnTouchListener(OnTouchListener l);
	public native void setOnClickListener(OnClickListener l);
	public /*native*/ void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) {}
	public native final int getWidth();
	public native final int getHeight();

	protected native long native_constructor(Context context, AttributeSet attrs); // will create a custom GtkWidget with a custom drawing function
	public native void native_setLayoutParams(long widget, int width, int height, int gravity, float weight, int leftMargin, int topMargin, int rightMargin, int bottomMargin);
	protected native void native_destructor(long widget);
	/**
	 * We decide between simple widgets which handles MEASURE_SPEC_AT_MOST the same way as
	 * MEASURE_SPEC_EXACTLY, and complex widgets which handles MEASURE_SPEC_AT_MOST by measuring the content
	 */
	protected native void native_measure(long widget, int widthMeasureSpec, int heightMeasureSpec, boolean isComplex);
	protected native void native_layout(long widget, int l, int t, int r, int b);
	protected native void native_requestLayout(long widget);
	protected native void native_setBackgroundDrawable(long widget, long paintable);

	// --- stubs

	public void setContentDescription(CharSequence contentDescription) {
		Slog.w(TAG, "setContentDescription called with: >" + contentDescription + "<");
	}

	public void setId(int id) {
		this.id = id;
		view_by_id.put(id, this);
	}

	public void setOnKeyListener(OnKeyListener l) {}

	public void setFocusable(boolean focusable) {}
	public void setFocusableInTouchMode(boolean focusableInTouchMode) {}
	public final boolean requestFocus() {
		return requestFocus(View.FOCUS_DOWN);
	}
	public final boolean requestFocus(int direction) {
		return requestFocus(direction, null);
	}
	public boolean requestFocus(int direction, Rect previouslyFocusedRect) {
		return true;
	}

	public void setSystemUiVisibility(int visibility) {
		system_ui_visibility = visibility;
	}
	public int getSystemUiVisibility() {
		return system_ui_visibility;
	};

	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		if (haveCustomMeasure) // calling native_measure here would create infinite loop
			setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec));
		else
			native_measure(widget, widthMeasureSpec, heightMeasureSpec, haveComplexMeasure);
	}

	public void setPressed(boolean pressed) {
		Slog.w(TAG, "calling setPressed on " + this + " with value: " + pressed);
		if (this.pressed != pressed) {
			this.pressed = pressed;
			if (background != null && background.isStateful())
				background.setState(getDrawableState());
		}
	}

	public void setSelected(boolean selected) {
		Slog.w(TAG, "calling setSelected on " + this + " with value: " + selected);
	}

	public ViewTreeObserver getViewTreeObserver() {
		return new ViewTreeObserver();
	}

	protected void onFinishInflate() {}

	public void invalidate(Rect dirty) {
		nativeInvalidate(widget);
	}
	public void invalidate(int l, int t, int r, int b) {
		nativeInvalidate(widget);
	}
	public void invalidate() {
		nativeInvalidate(widget);
	}
	private static native void nativeInvalidate(long widget);

	public native void setBackgroundColor(int color);
	public native void native_setVisibility(long widget, int visibility, float alpha);
	public void setVisibility(int visibility) {
		native_setVisibility(widget, visibility, alpha);
		if ((visibility == View.GONE) != (this.visibility == View.GONE)) {
			requestLayout();
		}
		this.visibility = visibility;
	}
	public void setPadding(int left, int top, int right, int bottom) {}
	public void setBackgroundResource(int resid) throws Exception {
		setBackgroundDrawable(getResources().getDrawable(resid));
	}

	public void getHitRect(Rect outRect) {}
	public final boolean getLocalVisibleRect(Rect r) { return false; }

	public final int getScrollX() {
		return scrollX;
	}
	public final int getScrollY() {
		return scrollY;
	}

	public void scrollTo(int x, int y) {
		scrollX = x;
		scrollY = y;
		invalidate();
	}

	protected void onScrollChanged(int l, int t, int oldl, int oldt) {}

	public void getLocationOnScreen(int[] location) { // FIXME: actually return the widget's location (and also have the onclick callback convert to window coordinates, because is seems that's what android deals in..)
		location[0] = 0;
		location[1] = 0;
	}

	public boolean performHapticFeedback(int feedbackConstant) {
		return performHapticFeedback(feedbackConstant, 0);
	}

	public boolean performHapticFeedback(int feedbackConstant, int flags) {
		Slog.v(TAG, "vibration motor go burrrr");
		return true; // FIXME why is it not void
	}

	public int getPaddingLeft() {
		return 0;
	}

	public int getPaddingRight() {
		return 0;
	}

	public int getPaddingTop() {
		return 0;
	}

	public int getPaddingBottom() {
		return 0;
	}

	public int getPaddingStart() {
		return 0;
	}

	public int getPaddingEnd() {
		return 0;
	}

	public void postInvalidate() {
		new Handler(Looper.getMainLooper()).post(new Runnable() {
			@Override
			public void run() {
				invalidate();
			}
		});
	}

	public void postInvalidate(final int left, final int top, final int right, final int bottom) {
		new Handler(Looper.getMainLooper()).post(new Runnable() {
			@Override
			public void run() {
				invalidate(left, top, right, bottom);
			}
		});
	}

	public void setOnGenericMotionListener(View.OnGenericMotionListener l) {}

	public IBinder getWindowToken() {
		return new IBinder();
	}

	public void getLocationInWindow(int[] xxx) {}

	public void addOnAttachStateChangeListener(OnAttachStateChangeListener l) {}

	public Context getContext() {
		return this.context;
	}

	public void refreshDrawableState() {
	}

	public void setDescendantFocusability(int value) {}

	public void setAccessibilityDelegate(AccessibilityDelegate delegate) {}

	public static class AccessibilityDelegate {}

	public Drawable getBackground() {
		return background;
	}

	public void setClickable(boolean clickable) {}

	public void setEnabled(boolean enabled) {}

	public CharSequence getContentDescription() {
		return null;
	}

	public void setOnLongClickListener(OnLongClickListener listener) {}

	public void setLongClickable(boolean longClickable) {}

	public void setOnHoverListener(OnHoverListener listener) {}

	public final void measure(int widthMeasureSpec, int heightMeasureSpec) {
		if (layoutRequested || widthMeasureSpec != oldWidthMeasureSpec || heightMeasureSpec != oldHeightMeasureSpec) {
			oldWidthMeasureSpec = widthMeasureSpec;
			oldHeightMeasureSpec = heightMeasureSpec;
			onMeasure(widthMeasureSpec, heightMeasureSpec);
			layoutRequested = false;
		}
	}

	public final int getMeasuredState() {
		return 0;
	}

	public static int combineMeasuredStates(int curState, int newState) {
		return curState | newState;
	}

	protected int getSuggestedMinimumHeight() {
		return 10;
	}
	protected int getSuggestedMinimumWidth() {
		return 10;
	}

	/**
	 * Utility to reconcile a desired size and state, with constraints imposed
	 * by a MeasureSpec.  Will take the desired size, unless a different size
	 * is imposed by the constraints.  The returned value is a compound integer,
	 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and
	 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting
	 * size is smaller than the size the view wants to be.
	 *
	 * @param size How big the view wants to be
	 * @param measureSpec Constraints imposed by the parent
	 * @return Size information bit mask as defined by
	 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
	 */
	public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) {
		int result = size;
		int specMode = MeasureSpec.getMode(measureSpec);
		int specSize =  MeasureSpec.getSize(measureSpec);
		switch (specMode) {
		case MeasureSpec.UNSPECIFIED:
			result = size;
			break;
		case MeasureSpec.AT_MOST:
			if (specSize < size) {
				result = specSize | MEASURED_STATE_TOO_SMALL;
			} else {
				result = size;
			}
			break;
		case MeasureSpec.EXACTLY:
			result = specSize;
			break;
		}
		return result | (childMeasuredState&MEASURED_STATE_MASK);
	}

	public static int resolveSize(int size, int measureSpec) {
        return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK;
    }

	public final int getMeasuredWidth() {
		return this.measuredWidth & MEASURED_SIZE_MASK;
	}

	public final int getMeasuredHeight() {
		return this.measuredHeight & MEASURED_SIZE_MASK;
	}

	protected void onLayout(boolean changed, int l, int t, int r, int b) {}

	public void layout(int l, int t, int r, int b) {
		this.left = l;
		this.top = t;
		this.right = r;
		this.bottom = b;
		native_layout(widget, l, t, r, b);
	}

	/** Helper function to be called from GTKs LayoutManager via JNI */
	private void layoutInternal(int width, int height) {
		// if the layout is triggered from a native widget, we might not have measured yet
		if (width != getMeasuredWidth() || height != getMeasuredHeight()) {
			measure(width | MeasureSpec.EXACTLY, height | MeasureSpec.EXACTLY);
		}
		boolean changed = oldWidth != width || oldHeight != height;
		if (changed)
			onSizeChanged(width, height, oldWidth, oldHeight);
		onLayout(changed, 0, 0, width, height);
		oldWidth = width;
		oldHeight = height;
	}

	public int getLeft() {
		return left;
	}
	public int getTop() {
		return top;
	}
	public int getRight() {
		return right;
	}
	public int getBottom() {
		return bottom;
	}

	public void offsetTopAndBottom(int offset) {
		layout(left, top + offset, right, bottom + offset);
	}

	public void offsetLeftAndRight(int offset) {
		layout(left + offset, top, right + offset, bottom);
	}

	public void setBackgroundDrawable(Drawable backgroundDrawable) {
		this.background = backgroundDrawable;
		native_setBackgroundDrawable(widget, backgroundDrawable != null ? backgroundDrawable.paintable : 0);
	}

	public int getOverScrollMode() {return 0;}

	public void setFitsSystemWindows(boolean fitsSystemWindows) {}

	public void setWillNotDraw(boolean value) {}

	public void setScrollContainer(boolean isScrollContainer) {}

	public boolean removeCallbacks(Runnable action) {return false;}

	public void requestLayout() {
		layoutRequested = true;
		if (parent != null && !parent.isLayoutRequested()) {
			parent.requestLayout();
		}
		native_requestLayout(widget);
	};

	public void setOverScrollMode(int mode) {}

	public int getId() {return id;}

	public boolean postDelayed(Runnable action, long delayMillis) {
		new Handler(Looper.getMainLooper()).postDelayed(action, delayMillis);
		return true;
	}

	public boolean post(Runnable action) {
		new Handler(Looper.getMainLooper()).post(action);
		return true;
	}

	public void setSaveFromParentEnabled(boolean enabled) {}

	public void setTag(int key, Object tag) {
		tags.put(key, tag);
	}
	public Object getTag(int key) {
		return tags.get(key);
	}

	public void setTag(Object tag) {
		this.tag = tag;
	}
	public Object getTag() {
		return tag;
	}

	public void addOnLayoutChangeListener(OnLayoutChangeListener listener) {}
	public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) {}

	public boolean isSelected() {return false;}

	public void sendAccessibilityEvent(int eventType) {}

	public void setMinimumHeight(int minHeight) {}
	public void setMinimumWidth(int minWidth) {}

	public void setActivated (boolean activated) {}

	public int getVisibility() {return visibility;}

	public boolean isInEditMode() {return false;}

	@Override
	protected void finalize() throws Throwable {
		try {
			native_destructor(widget);
		} finally {
			super.finalize();
		}
	}

	public final int[] getDrawableState() {
		int[] state = new int[2];
		state[0] = R.attr.state_enabled;
		if (pressed) {
			state[1] = R.attr.state_pressed;
		}
		return state;
	}

	public float getRotation() {return 0.f;}

	public void bringToFront() {}

	public boolean isEnabled() {return true;}
	public boolean hasFocus() {return false;}
	public boolean isLayoutRequested() {return layoutRequested;}
	public int getBaseline() {return -1;}
	public boolean hasFocusable() {return false;}
	public boolean isFocused() {return false;}

	public void clearAnimation() {}

	public ViewPropertyAnimator animate() {
		return new ViewPropertyAnimator(this);
	}

	public float getTranslationX() {return 0.f;}
	public float getTranslationY() {return 0.f;}
	public void setTranslationX(float translationX) {}
	public void setTranslationY(float translationY) {}

	public void setAlpha(float alpha) {
		native_setVisibility(widget, visibility, alpha);
		this.alpha = alpha;
	}

	public boolean onGenericMotionEvent(MotionEvent event) {return false;}

	protected boolean awakenScrollBars() {return false;}
	public Matrix getMatrix() {return new Matrix();}

	protected static final int[] EMPTY_STATE_SET = new int[0];

	/**
	 * Utility to return a default size. Uses the supplied size if the
	 * MeasureSpec imposed no constraints. Will get larger if allowed
	 * by the MeasureSpec.
	 *
	 * @param size Default size for this view
	 * @param measureSpec Constraints imposed by the parent
	 * @return The size this view should be.
	 */
	public static int getDefaultSize(int size, int measureSpec) {
		int result = size;
		int specMode = MeasureSpec.getMode(measureSpec);
		int specSize = MeasureSpec.getSize(measureSpec);
		switch (specMode) {
		case MeasureSpec.UNSPECIFIED:
			result = size;
			break;
		case MeasureSpec.AT_MOST:
		case MeasureSpec.EXACTLY:
			result = specSize;
			break;
		}
		return result;
	}

	public static class BaseSavedState extends AbsSavedState {
	}

	public void clearFocus() {}

	public void setRotation(float rotation) {}

	public void setScaleX(float scaleX) {}
	public void setScaleY(float scaleY) {}

	public static View inflate(Context context, int resource, ViewGroup root) {
		LayoutInflater factory = LayoutInflater.from(context);
		return factory.inflate(resource, root);
	}

	public void saveHierarchyState(SparseArray<Parcelable> array) {}

	public void setDuplicateParentStateEnabled(boolean enabled) {}

	public boolean performClick() {
		return false;
	}

	public void playSoundEffect(int soundConstant) {}

	public void computeScroll() {}

	public void jumpDrawablesToCurrentState() {}

	public void setOnFocusChangeListener (View.OnFocusChangeListener l) {}

	public boolean hasWindowFocus() {return true;}

	public void setSaveEnabled (boolean enabled) {}

	public boolean willNotDraw() {return false;}

	public void setOnCreateContextMenuListener (View.OnCreateContextMenuListener l) {}

	public void startAnimation(Animation animation) {}

	public void getDrawingRect(Rect rect) {
		rect.left = getScrollX();
		rect.top = getScrollY();
		rect.right = getScrollX() + getWidth();
		rect.bottom = getScrollY() + getHeight();
	}

	public Display getDisplay() {
		return new Display();
	}

	private int importantForAccessibility;
	public void setImportantForAccessibility(int importantForAccessibility) {
		this.importantForAccessibility = importantForAccessibility;
	}
	public int getImportantForAccessibility() {
		return importantForAccessibility;
	}

	public boolean getFitsSystemWindows() {return true;}

	public void setOnApplyWindowInsetsListener(View.OnApplyWindowInsetsListener l) {}

	public final boolean isFocusable() {return true;}
	public boolean isClickable() {return true;}
	public boolean isLongClickable() {return true;}

	public int getLayoutDirection() {return LAYOUT_DIRECTION_LTR;}

	public void setBackground(Drawable background) {
		setBackgroundDrawable(background);
	}

	private float elevation;
	public void setElevation(float elevation) {
		this.elevation = elevation;
	}
	public float getElevation() {
		return elevation;
	}

	public boolean isLaidOut() {return true;}

	public void postOnAnimation(Runnable action) {
		post(action);
	}

	public void setHorizontalScrollBarEnabled(boolean enabled) {}

	public void postInvalidateOnAnimation() {
		postInvalidate();
	}

	public void setPaddingRelative(int start, int top, int end, int bottom) {}

	public boolean isAttachedToWindow() {return attachedToWindow;}

	public void requestApplyInsets() {}

	public View getRootView() {
		View view = this;
		while (view.parent != null) {
			view = view.parent;
		}
		return view;
	}

	public boolean isShown() {return true;}

	public int getWindowVisibility() {return VISIBLE;}

	public float getAlpha() {return alpha;}

	public View findFocus() {return this;}

	public int getMinimumHeight() {return getSuggestedMinimumHeight();}
	public int getMinimumWidth() {return getSuggestedMinimumWidth();}

	public boolean isNestedScrollingEnabled() {return true;}

	public void setClipToOutline(boolean clipToOutline) {}

	public boolean hasTransientState() {return false;}

	public final void cancelPendingInputEvents() {}

	public ViewOutlineProvider getOutlineProvider() {return new ViewOutlineProvider();}
	public void setOutlineProvider(ViewOutlineProvider provider) {}

	public void setStateListAnimator(StateListAnimator stateListAnimator) {}

	private static final AtomicInteger nextGeneratedId = new AtomicInteger(1);
	/**
     * Generate a value suitable for use in {@link #setId(int)}.
     * This value will not collide with ID values generated at build time by aapt for R.id.
     *
     * @return a generated ID value
     */
    public static int generateViewId() {
        for (;;) {
            final int result = nextGeneratedId.get();
            // aapt-generated IDs have the high byte nonzero; clamp to the range under that.
            int newValue = result + 1;
            if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0.
            if (nextGeneratedId.compareAndSet(result, newValue)) {
                return result;
            }
        }
    }

	public boolean isLayoutDirectionResolved() {return true;}

	public boolean isPaddingRelative() {return false;}

	public void setForeground(Drawable foreground) {}

	public boolean canScrollVertically(int value) {return true;}

	public boolean isInTouchMode() {return false;}

	public void stopNestedScroll() {}

	public long getDrawingTime() {
		return System.currentTimeMillis();
	}

	public void setKeepScreenOn(boolean screenOn) {}

	protected void onAttachedToWindow () {
		attachedToWindow = true;
	}

	public void setLayerType(int layerType, Paint paint) {}

	public float getZ() {return 0.f;}

	protected void onSizeChanged(int w, int h, int oldw, int oldh) {}

	public void setBackgroundTintList(ColorStateList tint) {}

	protected int computeHorizontalScrollRange() {
		return getWidth();
	}

	protected int computeHorizontalScrollExtent() {
		return getWidth();
	}

	protected int computeVerticalScrollRange() {
		return getHeight();
	}

	protected int computeVerticalScrollExtent() {
		return getHeight();
	}

	public void setAccessibilityLiveRegion(int mode) {}
}