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锁定老帖子 主题：EXT2的动态BorderLayout组件
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发表时间：2008-08-01
最后修改：2009-08-01
因为问答频道询问这个问题，自己也遇到过，以前是用动态改变south大小来实现的，尝试直接实现一个动态的BorderLayout，发现很简单，下面代码改写自BorderLayout的代码，实现BorderLayout区域的动态增减:
布局控制器的代码：
Ext.layout.DynamicBorderLayout = Ext.extend(Ext.layout.BorderLayout, {
onLayout : function(ct, target) {
var collapsed = [];
target.position();
if (!this.rendered) {
target.addClass('x-border-layout-ct');
this.rendered = true;
}
//这部分代码直接从上面this.rendered的条件移出来,增加typeof this[pos] == "undefined"的判断
var items = ct.items.items;
for (var i = 0, len = items.length; i < len; i++) {
var c = items[i];
var pos = c.region;
if (typeof this[pos] == "undefined")
{
if (c.collapsed) {
collapsed.push(c);
}
c.collapsed = false;
if (!c.rendered) {
c.cls = c.cls ? c.cls + ' x-border-panel' : 'x-border-panel';
c.render(target, i);
}
this[pos] = pos != 'center' && c.split ?
new Ext.layout.BorderLayout.SplitRegion(this, c.initialConfig, pos) :
new Ext.layout.BorderLayout.Region(this, c.initialConfig, pos);
this[pos].render(target, c);
}
}
//删除掉不需要的区域属性
this.removeNotExistsRegion(ct.items);
var size = target.getViewSize();
if (size.width < 20 || size.height < 20) { // display none?
if (collapsed) {
this.restoreCollapsed = collapsed;
}
return;
} else if (this.restoreCollapsed) {
collapsed = this.restoreCollapsed;
delete this.restoreCollapsed;
}
var w = size.width, h = size.height;
var centerW = w, centerH = h, centerY = 0, centerX = 0;
var n = this.north, s = this.south, west = this.west, e = this.east, c = this.center;
if (!c) {
throw 'No center region defined in BorderLayout ' + ct.id;
}
if (n && n.isVisible()) {
var b = n.getSize();
var m = n.getMargins();
b.width = w - (m.left + m.right);
b.x = m.left;
b.y = m.top;
centerY = b.height + b.y + m.bottom;
centerH -= centerY;
n.applyLayout(b);
}
if (s && s.isVisible()) {
var b = s.getSize();
var m = s.getMargins();
b.width = w - (m.left + m.right);
b.x = m.left;
var totalHeight = (b.height + m.top + m.bottom);
b.y = h - totalHeight + m.top;
centerH -= totalHeight;
s.applyLayout(b);
}
if (west && west.isVisible()) {
var b = west.getSize();
var m = west.getMargins();
b.height = centerH - (m.top + m.bottom);
b.x = m.left;
b.y = centerY + m.top;
var totalWidth = (b.width + m.left + m.right);
centerX += totalWidth;
centerW -= totalWidth;
west.applyLayout(b);
}
if (e && e.isVisible()) {
var b = e.getSize();
var m = e.getMargins();
b.height = centerH - (m.top + m.bottom);
var totalWidth = (b.width + m.left + m.right);
b.x = w - totalWidth + m.left;
b.y = centerY + m.top;
centerW -= totalWidth;
e.applyLayout(b);
}
var m = c.getMargins();
var centerBox = {
x: centerX + m.left,
y: centerY + m.top,
width: centerW - (m.left + m.right),
height: centerH - (m.top + m.bottom)
};
c.applyLayout(centerBox);
if (collapsed) {
for (var i = 0, len = collapsed.length; i < len; i++) {
collapsed[i].collapse(false);
}
}
if (Ext.isIE && Ext.isStrict) { // workaround IE strict repainting issue
target.repaint();
}
},
removeNotExistsRegion:function(items) {
var regions = ["north","south","west"];
for (var i = 0; i < regions.length; i++)
{
if (this[regions[i]] && !items.find(function(item) {
return item.region == regions[i]
}))
{
this[regions[i]] = undefined;
}
}
}
})
Ext.Container.LAYOUTS['dynamicborder'] = Ext.layout.DynamicBorderLayout;
可运行的例子:
Ext.onReady(function() {
var view = new Ext.Viewport({
layout:"fit",
items:{
layout:"dynamicborder",
items:[{
title: 'Main Content',
region:'center',
margins: '5 5 0 0',
tbar:[{
text:"增加南",
handler:function() {
var container = view.items.items[0];
var region = container.find("region", "south")[0];
if (region)
{
return;
}
container.add({
title: 'South Panel',
region: 'south',
height: 100,
minSize: 75,
maxSize: 250,
margins: '0 5 5 5'
});
container.doLayout();
}
},{
text:"去除南",
handler:function() {
var container = view.items.items[0];
var region = container.find("region", "south")[0];
container.remove(region);
container.doLayout();
}
},{
text:"增加西",
handler:function() {
var container = view.items.items[0];
var region = container.find("region", "west")[0];
if (region)
{
return;
}
container.add({
title: 'West Panel',
region:'west',
margins: '5 0 0 5',
cmargins: '5 5 0 5',
width: 200,
minSize: 100,
maxSize: 300
});
container.doLayout();
}
},{
text:"去除西",
handler:function() {
var container = view.items.items[0];
var region = container.find("region", "west")[0];
container.remove(region);
container.doLayout();
}
}]
}]
}
})
})
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发表时间：2008-08-03
非常感谢你的文章..........
不过 我在你有次的回复关于EXTJS 释放内存的方式 可以稍微指点下吗？ 你说的去掉MODAL 还有SHADOW 主要是去掉哪些关键代码？ 很容易都去掉出错了。。。。 MODAL:.. SHADOW:.. 只去掉这样的吗？ 打扰之处见谅...... 愿你工作顺利 |
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发表时间：2008-08-04
嗯，关于内存释放的问题，确认了问题的原因，怎样解决不清楚。modal:false,shadow:false可以，但是相应的特性就没有了
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发表时间：2008-08-09
当动态添加、删除splitregion时， splitBar删不掉， 需要手工删除。
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发表时间：2008-08-09
上面的问题，现在这样解决：
if (region) {
var splitBar = Ext.DomQuery.selectNode("div[@class*='x-layout-split x-layout-split-west']");
if(splitBar) {
//alert(splitBar.id);
Ext.get(splitBar.id).remove();
}
container.remove(region);
container.doLayout();
}
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