/**
* 计算目标组件子组件的排版
*
* @param component 目标组件
* @param layout 标识是否需要排版子组件
* @param preferredWidth 参考宽度
* @param metrics 组件的尺寸
*/
private void measure(
AbstractSNSComponent component, boolean layout, int preferredWidth, Metrics metrics) {
StyleSet styleSet = component.getDom().getStyleSet();
Insets insets = styleSet.getInsets(); // 获取组件的留白
Metrics minSize = styleSet.getMinSize(); // 获取组件的最小尺寸
Coordinates gap = styleSet.getGap(); // 获取组件间的间距
styleSet = null;
int width = preferredWidth - insets.left - insets.right; // 组件实际宽度
int height = component.getHeight() - insets.top - insets.bottom; // 组件实际高度
int top = 0;
int left = 0;
int right = 0;
int bottom = 0;
int centerHeight = 0;
int centerWidth = 0;
// 预设5个方位的组件
AbstractSNSComponent northWidget = null;
AbstractSNSComponent westWidget = null;
AbstractSNSComponent eastWidget = null;
AbstractSNSComponent southWidget = null;
AbstractSNSComponent centerWidget = null;
// 根据borderlayoutdata，分配子组件到5个方位
for (int i = 0; i < component.getChildrenNum(); i++) {
AbstractSNSComponent com = component.getChildComponent(i);
if (com != null) {
com.regist2Parent();
if (com.isVisible() && !com.shouldIgnoreLayout()) {
ILayoutData layoutData = com.getDom().getStyleSet().getLayoutData(); // 获取子组件的排版数据
if (layoutData != null
&& layoutData instanceof BorderLayoutData) { // borderlayout下只有borderlayoutdata有效
byte position = ((BorderLayoutData) layoutData).position;
layoutData = null;
switch (position) { // 将子组件分配到5个方位
case BorderLayoutData.NORTH:
northWidget = com;
break;
case BorderLayoutData.WEST:
westWidget = com;
break;
case BorderLayoutData.EAST:
eastWidget = com;
break;
case BorderLayoutData.SOUTH:
southWidget = com;
break;
default:
centerWidget = com;
break;
}
} else if (centerWidget == null) { // 默认居中
centerWidget = com;
}
}
com = null;
}
}
// 计算组件间间距
int verticalTopGap =
(northWidget != null
&& (westWidget != null
|| centerWidget != null
|| eastWidget != null
|| southWidget != null))
? gap.Y
: 0;
int verticalBottompGap =
(southWidget != null && (westWidget != null || centerWidget != null || eastWidget != null))
? gap.Y
: 0;
int horizontalLeftGap =
(westWidget != null && (centerWidget != null || eastWidget != null)) ? gap.X : 0;
int horizontalRightGap =
(eastWidget != null && (centerWidget != null || westWidget != null)) ? gap.X : 0;
int horizontalGap = horizontalLeftGap + horizontalRightGap;
int verticalGap = verticalTopGap + verticalBottompGap;
// North
if (northWidget != null) {
Metrics preferredSize = northWidget.getPreferredSize(width, width);
centerWidth = preferredSize.width;
top = preferredSize.height;
preferredSize = null;
}
// West
if (westWidget != null) {
Metrics preferredSize =
westWidget.getPreferredSize(width - horizontalGap, width - horizontalGap);
left = preferredSize.width;
centerHeight = preferredSize.height;
preferredSize = null;
}
// East
if (eastWidget != null) {
Metrics preferredSize =
eastWidget.getPreferredSize(width - left - horizontalGap, width - left - horizontalGap);
right = preferredSize.width;
centerHeight = Math.max(centerHeight, preferredSize.height);
preferredSize = null;
}
// South
if (southWidget != null) {
Metrics preferredSize = southWidget.getPreferredSize(width, width);
centerWidth = Math.max(centerWidth, preferredSize.width);
bottom = preferredSize.height;
preferredSize = null;
}
// Center
if (centerWidget != null) {
Metrics preferredSize =
centerWidget.getPreferredSize(
width - left - right - horizontalGap, width - left - right - horizontalGap);
centerWidth = Math.max(centerWidth, preferredSize.width);
centerHeight = Math.max(centerHeight, preferredSize.height);
preferredSize = null;
}
// 如果不需要排版子组件，直接更新组件宽度高度就OK
if (!layout) {
metrics.width =
insets.left
+ Math.max(minSize.width, left + centerWidth + right + horizontalGap)
+ insets.right;
metrics.height =
insets.top
+ Math.max(minSize.height, top + centerHeight + bottom + verticalGap)
+ insets.bottom;
return;
}
centerWidth = width - left - right - horizontalGap;
centerHeight = height - top - bottom - verticalGap;
// 如果需要对子组件进行排版，依次对5个方位的子组件进行排版
// Center
if (centerWidget != null) {
centerWidget.setBounds(
insets.left + left + horizontalLeftGap,
insets.top + top + verticalTopGap,
centerWidth,
centerHeight);
}
// North
if (northWidget != null) {
northWidget.setBounds(insets.left, insets.top, width, top);
}
// West
if (westWidget != null) {
westWidget.setBounds(insets.left, insets.top + top + verticalTopGap, left, centerHeight);
}
// East
if (eastWidget != null) {
eastWidget.setBounds(
insets.left + width - right, insets.top + top + verticalTopGap, right, centerHeight);
}
// South
if (southWidget != null) {
southWidget.setBounds(insets.left, insets.top + height - bottom, width, bottom);
}
insets = null;
minSize = null;
gap = null;
}
/*
* (non-Javadoc)
*
* @see
* zincfish.zinclayout.Layout#doLayout(zincfish.zincwidget.AbstractSNSComponent
* )
*/
public void doLayout(AbstractSNSComponent component) {
measure(component, true, component.getWidth(), null);
}
