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Bug 461804: avoid having to scroll the underlying <browser> when redispatching clicks and retrieving elements, r=stuart

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This commit is contained in:
Gavin Sharp 2008-11-09 01:40:57 -05:00
parent 5be806b822
commit 14f7c74f04
1 changed files with 37 additions and 33 deletions
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70
mobile/chrome/content/deckbrowser.xml
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@ -646,11 +646,14 @@
width : width,
height: height };
// check to see if the input coordinates are inside the visiable destination
let r2 = { x : this.dragData.pageX,
y : this.dragData.pageY,
width : this._canvas.width / this._zoomLevel,
height: this._canvas.height / this._zoomLevel };
// check to see if the input coordinates are inside the visible destination
let [canvasW, canvasH] = this._effectiveCanvasDimensions;
let r2 = {
x : this.dragData.pageX,
y : this.dragData.pageY,
width : canvasW,
height: canvasH
};
let dest = intersect(r1, r2);
@ -772,32 +775,41 @@
]]></body>
</method>
/**
* Retrieve the content element for a given point (relative to the top
* left corner of the browser window).
*/
<!--
- Retrieve the content element for a given point in client coordinates
- (relative to the top left corner of the chrome window).
-->
<method name="elementFromPoint">
<parameter name="aX"/>
<parameter name="aY"/>
<body><![CDATA[
var cdoc = this.browser.contentDocument;
var [x, y] = this._clientToContentCoords(aX, aY);
var element = cdoc.elementFromPoint(x, y);
var cwu = this.browser.contentWindow
.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
.getInterface(Components.interfaces.nsIDOMWindowUtils);
var element = cwu.elementFromPoint(x, y,
true, /* ignore root scroll frame */
false); /* don't flush layout*/
return element;
]]></body>
</method>
<!--
- Retrieve the page position for a given element
- (relative to the document origin).
-->
<method name="_getPagePosition">
<parameter name="aElement"/>
<body><![CDATA[
var r = aElement.getBoundingClientRect();
var cwin = this.browser.contentWindow;
var retVal = {
width: r.width,
height: r.height,
x: r.left,
y: r.top
x: r.left + cwin.scrollX,
y: r.top + cwin.scrollY
};
return retVal;
@ -815,6 +827,7 @@
var [x, y] = this._clientToContentCoords(aEvent.clientX, aEvent.clientY);
// Redispatch the mouse event, ignoring the root scroll frame
var cwin = this.browser.contentWindow;
var cwu = cwin.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
.getInterface(Components.interfaces.nsIDOMWindowUtils);
@ -822,37 +835,28 @@
x, y,
aEvent.button || 0,
aEvent.detail || 1,
0);
0, true);
]]></body>
</method>
<!-- Given a set of client coordinates (relative to the app window),
scrolls the content window as close to the clicked on content item
as possible, and returns the remaining offsets into the content
window if the object isn't at 0, 0. Callers should be sure to reset
scroll state after calling this method.
returns the content coordinates relative to the viewport.
-->
<method name="_clientToContentCoords">
<parameter name="aClientX"/>
<parameter name="aClientY"/>
<body><![CDATA[
// Determine position relative to the document origin
// Need to adjust for the deckbrowser not being at 0,0
// (e.g. due to other browser UI)
var browserRect = this.getBoundingClientRect();
let browserRect = this.getBoundingClientRect();
let clickOffsetX = this._screenToPage(aClientX - browserRect.left) + this.dragData.pageX;
let clickOffsetY = this._screenToPage(aClientY - browserRect.top) + this.dragData.pageY;
var clickOffsetX = this._screenToPage(aClientX - browserRect.left) + this.dragData.pageX;
var clickOffsetY = this._screenToPage(aClientY - browserRect.top) + this.dragData.pageY;
// Scroll the browser so that the event is targeted properly
var cwin = this.browser.contentWindow;
cwin.scrollTo(clickOffsetX, clickOffsetY);
// Might not have been able to scroll all the way if we're zoomed in,
// so we need to account for that difference.
var pageOffsetX = clickOffsetX - cwin.scrollX;
var pageOffsetY = clickOffsetY - cwin.scrollY;
return [pageOffsetX, pageOffsetY];
// Take scroll offset into account to return coordinates relative to the viewport
let cwin = this.browser.contentWindow;
return [clickOffsetX - cwin.scrollX,
clickOffsetY - cwin.scrollY];
]]></body>
</method>