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Bug 733041 - Adjust the velocity bias strategy to keep a small buffer in the opposite direction of the scroll. r=Cwiiis

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This commit is contained in:
Kartikaya Gupta 2012-04-10 13:56:25 -05:00
parent 02f826e438
commit 617cfd1a55
1 changed files with 13 additions and 8 deletions
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21
mobile/android/base/gfx/DisplayPortCalculator.java
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@ -216,14 +216,17 @@ final class DisplayPortCalculator {
* they are affected by the panning velocity. Specifically, if we are panning on one axis,
* we remove the margins on the other axis because we are likely axis-locked. Also once
* we are panning in one direction above a certain threshold velocity, we shift the buffer
* so that it is entirely in the direction of the pan.
* so that it is almost entirely in the direction of the pan, with a little bit in the
* reverse direction.
*/
private static class VelocityBiasStrategy implements DisplayPortStrategy {
// The length of each axis of the display port will be the corresponding view length
// multiplied by this factor.
private static final float SIZE_MULTIPLIER = 1.2f;
private static final float SIZE_MULTIPLIER = 1.5f;
// The velocity above which we apply the velocity bias
private static final float VELOCITY_THRESHOLD = GeckoAppShell.getDpi() / 32f;
// How much of the buffer to keep in the reverse direction of the velocity
private static final float REVERSE_BUFFER = 0.2f;
public DisplayPortMetrics calculate(ImmutableViewportMetrics metrics, PointF velocity) {
float displayPortWidth = metrics.getWidth() * SIZE_MULTIPLIER;
@ -249,21 +252,23 @@ final class DisplayPortCalculator {
// the display port.
RectF margins = new RectF();
if (velocity.x > VELOCITY_THRESHOLD) {
margins.right = horizontalBuffer;
margins.left = horizontalBuffer * REVERSE_BUFFER;
} else if (velocity.x < -VELOCITY_THRESHOLD) {
margins.left = horizontalBuffer;
margins.left = horizontalBuffer * (1.0f - REVERSE_BUFFER);
} else {
margins.left = horizontalBuffer / 2.0f;
margins.right = horizontalBuffer - margins.left;
}
margins.right = horizontalBuffer - margins.left;
if (velocity.y > VELOCITY_THRESHOLD) {
margins.bottom = verticalBuffer;
margins.top = verticalBuffer * REVERSE_BUFFER;
} else if (velocity.y < -VELOCITY_THRESHOLD) {
margins.top = verticalBuffer;
margins.top = verticalBuffer * (1.0f - REVERSE_BUFFER);
} else {
margins.top = verticalBuffer / 2.0f;
margins.bottom = verticalBuffer - margins.top;
}
margins.bottom = verticalBuffer - margins.top;
// and finally shift the margins to account for page bounds
margins = shiftMarginsForPageBounds(margins, metrics);