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Applying fake perspective transform to the home screen previews

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Change-Id: I2092fd963804eceaf0117bcb6d118d83e0da3573
This commit is contained in:
Adam Cohen
2010-09-09 11:23:48 -07:00
parent 031e10649a
commit a985e598f6
2 changed files with 45 additions and 14 deletions
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src/com/android/launcher2/Workspace.java
+43 -12
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@@ -64,6 +64,16 @@ public class Workspace extends SmoothPagedView
// This is how much the workspace shrinks when we enter all apps or
// customization mode
private static final float SHRINK_FACTOR = 0.16f;
// The maximum Y rotation to apply to the mini home screens
private static final float MINI_PAGE_MAX_ROTATION = 25.0f;
// These are extra scale factors to apply to the mini home screens
// so as to achieve the desired transform
private static final float EXTRA_SCALE_FACTOR_0 = 0.97f;
private static final float EXTRA_SCALE_FACTOR_1 = 1.0f;
private static final float EXTRA_SCALE_FACTOR_2 = 1.13f;
private enum ShrinkPosition { SHRINK_TO_TOP, SHRINK_TO_MIDDLE, SHRINK_TO_BOTTOM };
private final WallpaperManager mWallpaperManager;
@@ -91,7 +101,6 @@ public class Workspace extends SmoothPagedView
private IconCache mIconCache;
private DragController mDragController;
private int[] mTempCell = new int[2];
private int[] mTempEstimate = new int[2];
private float[] mTempDragCoordinates = new float[2];
@@ -572,6 +581,18 @@ public class Workspace extends SmoothPagedView
}
}
private float getYScaleForScreen(int screen) {
int x = Math.abs(screen - 2);
// TODO: This should be generalized for use with arbitrary rotation angles.
switch(x) {
case 0: return EXTRA_SCALE_FACTOR_0;
case 1: return EXTRA_SCALE_FACTOR_1;
case 2: return EXTRA_SCALE_FACTOR_2;
}
return 1.0f;
}
// we use this to shrink the workspace for the all apps view and the customize view
private void shrink(ShrinkPosition shrinkPosition, boolean animated) {
mIsSmall = true;
@@ -585,10 +606,10 @@ public class Workspace extends SmoothPagedView
final int scaledPageWidth = (int) (SHRINK_FACTOR * pageWidth);
final int scaledPageHeight = (int) (SHRINK_FACTOR * pageHeight);
final float scaledSpacing = res.getDimension(R.dimen.smallScreenSpacing);
final float extraScaledSpacing = res.getDimension(R.dimen.smallScreenExtraSpacing);
final int screenCount = getChildCount();
float totalWidth = screenCount * scaledPageWidth + (screenCount - 1) * scaledSpacing;
float totalWidth = screenCount * scaledPageWidth + (screenCount - 1) * extraScaledSpacing;
float newY = getResources().getDimension(R.dimen.smallScreenVerticalMargin);
if (shrinkPosition == ShrinkPosition.SHRINK_TO_BOTTOM) {
@@ -602,27 +623,37 @@ public class Workspace extends SmoothPagedView
// newX is initialized to the left-most position of the centered screens
float newX = mScroller.getFinalX() + screenWidth / 2 - totalWidth / 2;
// We are going to scale about the center of the view, so we need to adjust the positions
// of the views accordingly
newX -= (pageWidth - scaledPageWidth) / 2.0f;
newY -= (pageHeight - scaledPageHeight) / 2.0f;
for (int i = 0; i < screenCount; i++) {
CellLayout cl = (CellLayout) getChildAt(i);
cl.setPivotX(0.0f);
cl.setPivotY(0.0f);
float rotation = (-i + 2) * MINI_PAGE_MAX_ROTATION / 2.0f;
float rotationScaleX = (float) (1.0f / Math.cos(Math.PI * rotation / 180.0f));
float rotationScaleY = getYScaleForScreen(i);
if (animated) {
final int duration = res.getInteger(R.integer.config_workspaceShrinkTime);
new ObjectAnimator(duration, cl,
new PropertyValuesHolder("x", newX),
new PropertyValuesHolder("y", newY),
new PropertyValuesHolder("scaleX", SHRINK_FACTOR),
new PropertyValuesHolder("scaleY", SHRINK_FACTOR),
new PropertyValuesHolder("dimmedBitmapAlpha", 1.0f)).start();
new PropertyValuesHolder("scaleX", SHRINK_FACTOR * rotationScaleX),
new PropertyValuesHolder("scaleY", SHRINK_FACTOR * rotationScaleY),
new PropertyValuesHolder("dimmedBitmapAlpha", 1.0f),
new PropertyValuesHolder("rotationY", rotation)).start();
} else {
cl.setX((int)newX);
cl.setY((int)newY);
cl.setScaleX(SHRINK_FACTOR);
cl.setScaleY(SHRINK_FACTOR);
cl.setDimmedBitmapAlpha(1.0f);
cl.setRotationY(rotation);
}
// increment newX for the next screen
newX += scaledPageWidth + scaledSpacing;
newX += scaledPageWidth + extraScaledSpacing;
cl.setOnInterceptTouchListener(this);
}
setChildrenDrawnWithCacheEnabled(true);
@@ -668,21 +699,21 @@ public class Workspace extends SmoothPagedView
final int duration = getResources().getInteger(R.integer.config_workspaceUnshrinkTime);
for (int i = 0; i < screenCount; i++) {
final CellLayout cl = (CellLayout)getChildAt(i);
cl.setPivotX(0.0f);
cl.setPivotY(0.0f);
if (animated) {
s.playTogether(
new ObjectAnimator<Float>(duration, cl, "translationX", 0.0f),
new ObjectAnimator<Float>(duration, cl, "translationY", 0.0f),
new ObjectAnimator<Float>(duration, cl, "scaleX", 1.0f),
new ObjectAnimator<Float>(duration, cl, "scaleY", 1.0f),
new ObjectAnimator<Float>(duration, cl, "dimmedBitmapAlpha", 0.0f));
new ObjectAnimator<Float>(duration, cl, "dimmedBitmapAlpha", 0.0f),
new ObjectAnimator<Float>(duration, cl, "rotationY", 0.0f));
} else {
cl.setTranslationX(0.0f);
cl.setTranslationY(0.0f);
cl.setScaleX(1.0f);
cl.setScaleY(1.0f);
cl.setDimmedBitmapAlpha(0.0f);
cl.setRotationY(0.0f);
}
}
s.addListener(mUnshrinkAnimationListener);