Java:调整大小和大小可拖动组件
我正在用 Java 制作一个免费的跨平台模型设计器。我设计了用户界面和能够在面板上添加组件(由用户选择)。现在我希望执行以下操作
- 1.使添加的组件在应用程序运行时可调整大小。我的意思是我想在鼠标移动时显示双头箭头指针位于该组件的边界,以便用户开始拖动鼠标指针并单击该组件。它的大小增加或减少。
2.在拖动时启用面板内组件的平滑移动。(此时它看起来令人沮丧,因为它在移动时闪烁(闪烁)并将其自身放置在另一个位置而不是鼠标指针热点!)
3.一些组件(在添加过程中 )通过从组件窗格中选择该组件然后单击面板来将其放置在距预期点(热点)稍远的位置。 这是拖动的代码:
public void dragControl(MouseEvent evt)
{
JComponent jc=(JComponent)evt.getSource();
if((evt.getX()<drawingPane.getWidth()-64)&&(evt.getY()<drawingPane.getHeight()-32))
{
jc.setLocation(evt.getX(),evt.getY());
drawingPane.validate();
}
}
这是在面板中添加组件的代码。(drawingpane)
private void finalizeControlAddition(JComponent c,JComponent cont,MouseEvent evt,int width,int height)
{
if((evt.getX()<drawingPane.getWidth()-width)&&(evt.getY()<drawingPane.getHeight()-height))
addComponent(cont,c,evt.getX(),evt.getY(),width,height);
//
c.setName(Integer.toString(counter));//save a tag of its identification
//
components.add(counter, c);
counter++;
//
selectedControl=-1;
//
cont.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
//
statusLabel.setText("Control added.Drag to give proper position or select to change properties from Properties pane.");
}
private void addComponent(Container container,Component c,int x,int y,int width,int height)
{
c.setBounds(x,y,width,height);
container.add(c);
c.repaint();
}
I am making a free cross platform mock up designer in Java. I have designed the UI & was able to add components(selected by user) on a Panel.Now I wish to do following things-
1.make the added components re-sizable while the app is running.I mean I want to show a double head arrow when the mouse pointer is at border of that component so that user starts drag the mouse pointer & its size increases or decreases.
2.enable smooth move of components inside the panel while dragged.(by this time it seems frustrating because it blinks(flickers) while moving & place it self in another position rather than mouse pointer hotspot!)
3.Some components(during adding to panel by selecting that component from component pane then clicking on the panel) are placed a bit far from expected point(hotspot).
Here's the code for drag:
public void dragControl(MouseEvent evt)
{
JComponent jc=(JComponent)evt.getSource();
if((evt.getX()<drawingPane.getWidth()-64)&&(evt.getY()<drawingPane.getHeight()-32))
{
jc.setLocation(evt.getX(),evt.getY());
drawingPane.validate();
}
}
and here's one that for adding the component in panel.(drawingpane)
private void finalizeControlAddition(JComponent c,JComponent cont,MouseEvent evt,int width,int height)
{
if((evt.getX()<drawingPane.getWidth()-width)&&(evt.getY()<drawingPane.getHeight()-height))
addComponent(cont,c,evt.getX(),evt.getY(),width,height);
//
c.setName(Integer.toString(counter));//save a tag of its identification
//
components.add(counter, c);
counter++;
//
selectedControl=-1;
//
cont.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
//
statusLabel.setText("Control added.Drag to give proper position or select to change properties from Properties pane.");
}
private void addComponent(Container container,Component c,int x,int y,int width,int height)
{
c.setBounds(x,y,width,height);
container.add(c);
c.repaint();
}
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经过努力我已经解决了这些问题。由于这些是任何人都可能面临的非常常见的问题,因此我创建了一个开放库来完成所有这些任务,您可以在应用程序中使用它们。可以在这里找到:
http://sourceforge.net/p/actioncomponent/home/Home
After trying hard I have solved these problems. As these are very common problems that anyone may face, I have created a open library for doing all these tasks which you can use in your app. It can be found here:
http://sourceforge.net/p/actioncomponent/home/Home