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Use <xul:browser>'s mapScreenCoordinatesFromContent only when it exists

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YUKI Hiroshi 2015-03-04 09:51:27 +09:00
parent 8cc5be8103
commit 5b612b9a84
1 changed files with 6 additions and 5 deletions
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11
modules/contentBridge.js
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@ -133,16 +133,17 @@ ContentBridge.prototype = inherit(TreeStyleTabConstants, {
},
fixupEventCoordinates : function CB_fixupEventCoordinates(aCoordinates)
{
// On Firefox 36 and later, screenX/screenY from content frame
// is wrong (the position (0,0) is not the screen edge, but the
// edge of the frame itself), so we have to calculate correct
// screen coordinates manually.
// On Firefox 36 and later, screenX/screenY from out-of-process
// content frame is wrong, so we have to calculate correct
// screen coordinates manually via the utility method.
// This hack should be removed after the bug
// https://bugzilla.mozilla.org/show_bug.cgi?id=1075670
// is fixed.
var fixedCoordinates = this.mTab.linkedBrowser.mapScreenCoordinatesFromContent(aCoordinates.screenX, aCoordinates.screenY);
if (typeof this.mTab.linkedBrowser.mapScreenCoordinatesFromContent == 'function') {
let fixedCoordinates = this.mTab.linkedBrowser.mapScreenCoordinatesFromContent(aCoordinates.screenX, aCoordinates.screenY);
aCoordinates.screenX = fixedCoordinates.x;
aCoordinates.screenY = fixedCoordinates.y;
}
return aCoordinates;
}
});