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Bug 639179 Part 2: Carefully track values sent to dragger r=mbrubeck

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This commit is contained in:
Benjamin Stover 2011-04-11 13:52:42 -07:00
parent f5144f5433
commit 2dbce49e47
1 changed files with 17 additions and 10 deletions
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27
mobile/chrome/content/input.js
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@ -884,15 +884,14 @@ KineticController.prototype = {
// Calculate new position using x(t) formula.
let x = v0Bin.set(v0).scale(t).add(aBin.set(a).scale(0.5 * t * t));
let dx = x.x - lastx.x;
let dy = x.y - lastx.y;
lastx.set(x);
let dx = Math.round(x.x - lastx.x);
let dy = Math.round(x.y - lastx.y);
// Test to see if movement is finished for each component. As seen in graph, we want the
// final position to be at tf.
if (t >= -v0.x / a.x) {
// Plug in t=-v0/a into x(t) to get final position.
dx = -v0.x * v0.x / 2 / a.x - lastx.x;
dx = Math.round(-v0.x * v0.x / 2 / a.x - lastx.x);
// Reset components. Next frame: a's component will be 0 and t >= NaN will be false.
lastx.x = 0;
v0.x = 0;
@ -900,18 +899,26 @@ KineticController.prototype = {
}
// Symmetric to above case.
if (t >= -v0.y / a.y) {
dy = -v0.y * v0.y / 2 / a.y - lastx.y;
dy = Math.round(-v0.y * v0.y / 2 / a.y - lastx.y);
lastx.y = 0;
v0.y = 0;
a.y = 0;
}
let panned = false;
try { panned = self._panBy(Math.round(-dx), Math.round(-dy), true); } catch (e) {}
if (!panned)
if (v0.x == 0 && v0.y == 0) {
self.end();
else
mozRequestAnimationFrame(this);
} else {
let panStop = false;
if (dx != 0 || dy != 0) {
try { panStop = !self._panBy(-dx, -dy, true); } catch (e) {}
lastx.add(dx, dy);
}
if (panStop)
self.end();
else
mozRequestAnimationFrame(this);
}
}
};