| 发表于：2007-04-10 17:45:51 楼主 |
问题（1):在实现了拖放后，按钮的前景色好象会没掉. 变成一个凹块,只有鼠标在上面左键点击放开才能恢复原状. 试过了给按钮 repaint（)还是不能解决.小生搞不出啥解决办法了.
问题（2):按扭都是在jpanel里，动态生成的. jpanel用了流布局,使其可以随窗口大小而自动排列.但是就不出现垂直滚动条.横的可以. 如果按扭一多,被挤压后成一排,那么没有滚动条下面的都点不到.影响可操作性.
附简单源代码:
import java.awt.borderlayout;
import java.awt.dimension;
import java.awt.flowlayout;
import java.awt.datatransfer.dataflavor;
import java.awt.datatransfer.stringselection;
import java.awt.datatransfer.transferable;
import java.awt.dnd.dndconstants;
import java.awt.dnd.draggestureevent;
import java.awt.dnd.draggesturelistener;
import java.awt.dnd.draggesturerecognizer;
import java.awt.dnd.dragsource;
import java.awt.dnd.dragsourcedragevent;
import java.awt.dnd.dragsourcedropevent;
import java.awt.dnd.dragsourceevent;
import java.awt.dnd.dragsourcelistener;
import java.awt.dnd.droptarget;
import java.awt.dnd.droptargetdragevent;
import java.awt.dnd.droptargetdropevent;
import java.awt.dnd.droptargetevent;
import java.awt.dnd.droptargetlistener;
import java.awt.event.actionevent;
import java.awt.event.actionlistener;
import java.awt.event.mouseadapter;
import java.awt.event.mouseevent;
import javax.swing.jbutton;
import javax.swing.jframe;
import javax.swing.jpanel;
import javax.swing.jscrollpane;
import javax.swing.jsplitpane;
import javax.swing.jtextarea;
public class test extends jframe implements dragsourcelistener,draggesturelistener{
private jsplitpane hsplitpane = new jsplitpane（);
private flowlayout fo = new flowlayout（flowlayout.center, 10, 10);
private dimension bdimension = new dimension（60, 40);
private dimension tdimension = new dimension（300,100);
private jpanel lpanel = new jpanel（fo);
private jpanel rpanel = new jpanel（fo);
private jpopupmenu panelpopup = new jpopupmenu（);
private jpopupmenu buttonpopup = new jpopupmenu（);
private jbutton choicedbutton;
private int count=8;
private dragsource ds;
private stringselection transferable;
public static void main（string args[]) {
new test（);
}
public test（) {
super（);
buildui（);
hsplitpane.setdividerlocation（300);
hsplitpane.setleftcomponent（lpanel);
hsplitpane.setrightcomponent（rpanel);
hsplitpane.setdoublebuffered（true);
hsplitpane.setcontinuouslayout（true);
this.setdefaultcloseoperation（jframe.exit_on_close);
this.getcontentpane（).add（hsplitpane, borderlayout.center);
this.setsize（700, 400);
this.setvisible（true);
}
public void buildui（) {
addlpanelbutton（20, " ");
jtextarea textarea = new jtextarea（ "drop items into this text area: ");
textarea.setpreferredsize（tdimension);
rpanel.add（new jscrollpane（textarea));
lpanel.setname（ "左键 ");
lpanel.add（panelpopup);
lpanel.setminimumsize（new dimension（0, 0));
rpanel.setminimumsize（new dimension（0, 0));
}
//在左边面板上添加按钮
private void addlpanelbutton（int btncount,string btnname) {
jbutton[] buttons = new jbutton[btncount];
for （int i = 0; i < btncount; i++) {
if（btncount==1){
buttons[i] = new jbutton（btnname);
}
else{
buttons[i] = new jbutton（string.valueof（i));
}
buttons[i].setpreferredsize（bdimension);
buttons[i].add（buttonpopup);
buttons[i].setactioncommand（ "button ");
ds = new dragsource（);
draggesturerecognizer dgr = ds.createdefaultdraggesturerecognizer（buttons[i],
dndconstants.action_copy, this);
lpanel.add（buttons[i]);
lpanel.updateui（);
}
}
//下面这几个方法是实现接口的 dragsourcelistener,draggesturelistener
public void draggesturerecognized（draggestureevent dge) {
system.out.println（ "drag gesture recognized! ");
jbutton button=（jbutton) dge.getcomponent（);
string content=button.gettext（);
if（content!=null){
transferable = new stringselection（content);
ds.startdrag（dge, dragsource.defaultcopydrop, transferable, this);
}
}
public void dragenter（dragsourcedragevent dsde) {
system.out.println（ "drag enter ");
}
public void dragexit（dragsourceevent dse) {
system.out.println（ "drag exit ");
}
public void dragover（dragsourcedragevent dsde) {
system.out.println（ "drag over ");
}
public void dragdropend（dragsourcedropevent dsde) {
system.out.print（ "drag drop end: ");
if （dsde.getdropsuccess（)) {
system.out.println（ "succeeded ");
} else {
system.out.println（ "failed ");
}
}
public void dropactionchanged（dragsourcedragevent dsde) {
system.out.println（ "drop action changed ");
}
}
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