firka/flutter
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Use localToGlobal and globalToLocal in MimicOverlay

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Also, make RenderStack support negative positions with clipping so that we can
expand objects that are partially offscreen.
This commit is contained in:
Adam Barth 2015-08-07 14:47:06 -07:00
parent 19fa9ae2d6
commit 68565eb317
3 changed files with 19 additions and 7 deletions
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21
packages/flutter/lib/rendering/stack.dart
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@ -38,12 +38,13 @@ class RenderStack extends RenderBox with ContainerRenderObjectMixin<RenderBox, S
addAll(children);
}
bool _hasVisualOverflow = false;
void setupParentData(RenderBox child) {
if (child.parentData is! StackParentData)
child.parentData = new StackParentData();
}
double getMinIntrinsicWidth(BoxConstraints constraints) {
double width = constraints.minWidth;
RenderBox child = firstChild;
@ -111,6 +112,7 @@ class RenderStack extends RenderBox with ContainerRenderObjectMixin<RenderBox, S
}
void performLayout() {
_hasVisualOverflow = false;
bool hasNonPositionedChildren = false;
double width = 0.0;
@ -175,14 +177,18 @@ class RenderStack extends RenderBox with ContainerRenderObjectMixin<RenderBox, S
x = childData.left;
else if (childData.right != null)
x = size.width - childData.right - child.size.width;
assert(x >= 0.0 && x + child.size.width <= size.width);
if (x < 0.0 || x + child.size.width > size.width)
_hasVisualOverflow = true;
double y = 0.0;
if (childData.top != null)
y = childData.top;
else if (childData.bottom != null)
y = size.height - childData.bottom - child.size.height;
assert(y >= 0.0 && y + child.size.height <= size.height);
if (y < 0.0 || y + child.size.height > size.height)
_hasVisualOverflow = true;
childData.position = new Point(x, y);
}
@ -196,6 +202,13 @@ class RenderStack extends RenderBox with ContainerRenderObjectMixin<RenderBox, S
}
void paint(PaintingCanvas canvas, Offset offset) {
defaultPaint(canvas, offset);
if (_hasVisualOverflow) {
canvas.save();
canvas.clipRect(offset & size);
defaultPaint(canvas, offset);
canvas.restore();
} else {
defaultPaint(canvas, offset);
}
}
}

3
packages/flutter/lib/widgets/mimic.dart
View File

@ -120,8 +120,7 @@ class Mimicable extends StatefulComponent {
if (_didStartMimic)
return;
assert(_mimic != null);
// TODO(abarth): We'll need to convert Point.origin to global coordinates.
Point globalPosition = Point.origin;
Point globalPosition = localToGlobal(Point.origin);
_mimic._startMimic(key, globalPosition & _size);
_didStartMimic = true;
}

2
packages/flutter/lib/widgets/mimic_overlay.dart
View File

@ -69,7 +69,7 @@ class MimicOverlay extends AnimatedComponent {
void _handleMimicCallback(Rect globalBounds) {
setState(() {
// TODO(abarth): We need to convert global bounds into local coordinates.
_mimicBounds.begin = globalBounds;
_mimicBounds.begin = globalToLocal(globalBounds.topLeft) & globalBounds.size;
_expandPerformance.forward();
});
}