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Bug 305730: Support page up/down in richlistbox, patch by Simon Bünzli <zeniko@gmail.com>, r=mconnor

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git-svn-id: svn://10.0.0.236/trunk@180332 18797224-902f-48f8-a5cc-f745e15eee43
This commit is contained in:
gavin%gavinsharp.com 2005-09-15 23:54:40 +00:00
parent 2d3012c169
commit eb5e8e85a4
1 changed files with 66 additions and 0 deletions
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66
mozilla/toolkit/content/widgets/richlistbox.xml
View File

@ -314,6 +314,70 @@
</body>
</method>
<method name="_isItemVisible">
<parameter name="aItem"/>
<body>
<![CDATA[
if (!aItem)
return false;
var y = {};
this.scrollBoxObject.getPosition({}, y);
y.value += this.scrollBoxObject.y;
// Partially visible items are also considered visible
return (aItem.boxObject.y + aItem.boxObject.height >= y.value) &&
(aItem.boxObject.y < y.value + this.scrollBoxObject.height);
]]>
</body>
</method>
<method name="scrollOnePage">
<parameter name="aDirection"/> <!-- Must be -1 or 1 -->
<body>
<![CDATA[
if (this.getRowCount() == 0)
return false;
var index = this.selectedIndex;
// If nothing is selected, we start at the extreme
// we're moving away from
if (index == -1)
index = aDirection == -1 ? this.getRowCount() - 1 : 0;
// If the selected item is visible, we scroll by one page so that
// the newly selected item is at approximately the same position as
// the currently selected one
var currentItem = this.getItemAtIndex(index);
if (this._isItemVisible(currentItem))
this.scrollBoxObject.scrollBy(0, this.scrollBoxObject.height * aDirection);
// Figure out, how many items fully fit into the view port
// (measuring from the top of the currently selected one), and
// determine the index of the first one lying (partially) outside
var height = this.scrollBoxObject.height;
while (height >= 0 && index >= 0 && index < this.getRowCount()) {
var actualIndex = (index && aDirection == -1) ? index - 1 : index;
height -= this.getItemAtIndex(actualIndex).boxObject.height;
index += aDirection;
}
index -= aDirection;
if (this.selectedItem != index) {
this.selectedItem = this.getItemAtIndex(index);
return true;
}
// Move by at least one item if the view port is too small
if (aDirection == -1)
return this.goUp();
return this.goDown();
]]>
</body>
</method>
<method name="getItemAtIndex">
<parameter name="aIndex"/>
<body>
@ -394,6 +458,8 @@
<handlers>
<handler event="keypress" keycode="VK_UP" action="goUp(); event.preventDefault();"/>
<handler event="keypress" keycode="VK_DOWN" action="goDown(); event.preventDefault();"/>
<handler event="keypress" keycode="VK_PAGE_UP" action="scrollOnePage(-1); event.preventDefault();"/>
<handler event="keypress" keycode="VK_PAGE_DOWN" action="scrollOnePage(1); event.preventDefault();"/>
<handler event="keypress" keycode="VK_HOME" action="clearSelection(); goDown(); event.preventDefault();"/>
<handler event="keypress" keycode="VK_END" action="clearSelection(); goUp(); event.preventDefault();"/>