查看this question(Swing中的可拖动选项卡)的解决方案后,我发现实际的TabbedPaneUI有一些方法可以解决这两个问题:只在选项卡区域拖动窗口,这是最难的部分,不在标签本身上方拖动。相关代码如下,在标有“// ::”的两部分中。该代码是从问题提及的Kirill代码改编而来的。代码不处理其他情况,而不是处理顶部的其他情况 - 这在考虑我想要做什么时很有意义。
// mouse listener for dragging the host window
MouseAdapter adapter = new MouseAdapter() {
int lastX;
int lastY;
boolean _dragInitiated;
@Override
public void mousePressed(MouseEvent e) {
TabbedPaneUI ui = _windowTabs.getUI();
// :: Won't drag if we're positioned above a tab in tab area
if (ui.tabForCoordinate(_windowTabs, e.getX(), e.getY()) != -1) {
_dragInitiated = false;
return;
}
// :: Won't drag if we're below the tab area
int maxY = 0;
for (int i = 0; i < _windowTabs.getTabCount(); i++) {
Rectangle bounds = ui.getTabBounds(_windowTabs, i);
int y = bounds.y + bounds.height;
if (y > maxY) {
maxY = y;
}
}
_dragInitiated = true;
if (maxY > 0) {
if (e.getY() > maxY) {
_dragInitiated = false;
}
}
Point eventLocationOnScreen = e.getLocationOnScreen();
if (eventLocationOnScreen == null) {
Component source = (Component) e.getSource();
eventLocationOnScreen = new Point(e.getX() + source.getLocationOnScreen().x, e.getY()
+ source.getLocationOnScreen().y);
}
lastX = eventLocationOnScreen.x;
lastY = eventLocationOnScreen.y;
}
@Override
public void mouseDragged(MouseEvent e) {
if (!_dragInitiated) {
return;
}
Point eventLocationOnScreen = e.getLocationOnScreen();
if (eventLocationOnScreen == null) {
Component source = (Component) e.getSource();
eventLocationOnScreen = new Point(e.getX() + source.getLocationOnScreen().x, e.getY()
+ source.getLocationOnScreen().y);
}
int dx = eventLocationOnScreen.x - lastX;
int dy = eventLocationOnScreen.y - lastY;
Window win = POTabbedFrame.this;
Point loc = win.getLocation();
win.setLocation(loc.x + dx, loc.y + dy);
lastX = eventLocationOnScreen.x;
lastY = eventLocationOnScreen.y;
}
};
_windowTabs.addMouseListener(adapter);
_windowTabs.addMouseMotionListener(adapter);