[英]Change cursor when hovering over JSplitPane divider
當我將鼠標懸停在JSplitPane
分隔符上時,需要更改光標。 這純粹是為了提高可用性。 我發現了兩種方法可以完成此任務。 如下所示的代碼
方法01
BasicSplitPaneUI basicSplitPaneUI = (BasicSplitPaneUI)splitPane.getUI();
BasicSplitPaneDivider divider = basicSplitPaneUI.getDivider();
divider.setCursor(new Cursor(Cursor.E_RESIZE_CURSOR));
方法02
Component divider = splitPane.getComponent(2);
divider.setCursor(new Cursor(Cursor.E_RESIZE_CURSOR));
我的問題是,如果JSplitPane
的頂部容器是JFrame
或JWindow
,那么這兩種方法都能按預期工作。 為了測試,我編寫了一小段代碼,其中將JSplitPane
添加到JPanel
,然后將其添加到JFrame
。 將鼠標懸停在分隔線上時,光標將按預期的方式更改。
但是我正在為intellij開發Tool Window
插件,在那里, JSplitPane
(包含在JPanel
)被添加到ToolWindow
容器中。 在這種情況下,當我將鼠標懸停在分隔線上時,光標將保持不變。
下面是我編寫的用於模擬上述情況的一些測試代碼。
案例01
public class Main {
public static void main(String args[]){
JFrame f = new JFrame();
f.setLayout(new BorderLayout());
//PanelWithSplitPane extends JPanel. Builds the JSplitPane
PanelWithSplitPane viewer = new PanelWithSplitPane();
f.add(viewer, BorderLayout.CENTER);
f.pack();
f.setVisible(true);
}
}
輸出:按預期工作。 光標懸停在分隔線上方時會發生變化
案例02:Intellij插件
注意:這是一個的IntelliJ插件項目,其中一個toolWindow
擴展在plugin.xml文件中指定。 基本上,當在IDE中打開工具窗口時,將執行createToolWindowContent
方法。 從此處處理視圖和任何其他用戶交互。
public class TestPane implements ToolWindowFactory {
//this method gets called when the toolWindow is opened in the IDE
@Override
public void createToolWindowContent(Project project, ToolWindow toolWindow) {
PanelWithSplitPane viewer = new PanelWithSplitPane();
toolWindow.getComponent().add(panel);
}
}
輸出:不能按預期工作。 將光標懸停在分隔線上方時,光標保持不變
PanelWithSplitPane代碼
public class PanelWithSplitPane extends JPanel {
public PanelWithSplitPane() {
this.setLayout(new BorderLayout());
JSplitPane splitPane = new javax.swing.JSplitPane();
splitPane.setBorder(null);
splitPane.setDividerLocation(1300);
splitPane.setDividerSize(6);
splitPane.setContinuousLayout(true);
splitPane.setOneTouchExpandable(true);
BasicSplitPaneUI basicSplitPaneUI = (BasicSplitPaneUI)splitPane.getUI();
BasicSplitPaneDivider divider = basicSplitPaneUI.getDivider();
divider.setCursor(new Cursor(Cursor.HAND_CURSOR));
this.add(splitPane);
}
}
例如,通過使用MouseListener及其方法mouseEntered / mouseExited(通過將Cursor返回到默認值)
請注意,我無法刪除黑色矩形(運行時創建的無用繪畫偽像,當移動分隔線時,您可以在左側看到它)
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTable;
import javax.swing.plaf.basic.BasicSplitPaneDivider;
import javax.swing.plaf.basic.BasicSplitPaneUI;
public class JSplitPaneToy {
private JSplitPane sp;
public JSplitPaneToy() {
sp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, makePanel(), makePanel());
/*SplitPaneUI ui = sp.getUI();
if (ui instanceof BasicSplitPaneUI) {
((BasicSplitPaneUI) ui).getDivider().setBorder(null);
}*/
BasicSplitPaneUI l_ui = (BasicSplitPaneUI) sp.getUI();
final BasicSplitPaneDivider l_divider = l_ui.getDivider();
l_divider.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseDragged(MouseEvent e) {
Dimension l_pane_size = sp.getSize();
if (sp.getOrientation() == JSplitPane.HORIZONTAL_SPLIT) {
int l_new_loc = sp.getDividerLocation() + e.getX();
if (l_new_loc >= 0 && l_new_loc <= l_pane_size.width) {
sp.setDividerLocation(l_new_loc);
}
} else {
int l_new_loc = sp.getDividerLocation() + e.getY();
if (l_new_loc >= 0 && l_new_loc <= l_pane_size.height) {
sp.setDividerLocation(l_new_loc);
}
}
}
});
l_divider.addMouseListener(new MouseAdapter() {
@Override
public void mouseEntered(MouseEvent e) {
l_divider.setCursor(new Cursor(Cursor.E_RESIZE_CURSOR));
}
@Override
public void mouseExited(MouseEvent e) {
l_divider.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
});
sp.setBorder(BorderFactory.createEmptyBorder());
/*sp = new JSplitPane(JSplitPane.VERTICAL_SPLIT, makePanel(), sp);
ui = sp.getUI();
if (ui instanceof BasicSplitPaneUI) {
((BasicSplitPaneUI) ui).getDivider().setBorder(null);
}
sp.setBorder(BorderFactory.createEmptyBorder());
sp = new JSplitPane(JSplitPane.VERTICAL_SPLIT, makePanel(), sp);
ui = sp.getUI();
if (ui instanceof BasicSplitPaneUI) {
((BasicSplitPaneUI) ui).getDivider().setBorder(null);
}
sp.setBorder(BorderFactory.createEmptyBorder());
sp = new JSplitPane(JSplitPane.VERTICAL_SPLIT, makePanel(), sp);
ui = sp.getUI();
if (ui instanceof BasicSplitPaneUI) {
((BasicSplitPaneUI) ui).getDivider().setBorder(null);
}
sp.setBorder(BorderFactory.createEmptyBorder());*/
JFrame frame = new JFrame("JSplitPane Toy");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(sp);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
/*try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
}*/
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JSplitPaneToy jSplitPaneToy = new JSplitPaneToy();
}
});
}
private JScrollPane makePanel() {
JScrollPane pane = new JScrollPane(new JTable(
new Object[][]{{0, 1, 2}, {1, 2, 3}, {2, 3, 4}}, new Object[]{1, 2, 3}) {
private static final long serialVersionUID = 1L;
});
pane.setPreferredSize(new Dimension(200, 100));
return pane;
}
}
我更改了將JPanel
添加到ToolWindow
的代碼,現在setCursor方法可以按預期工作。 更改如下所示。
舊版本:
PanelWithSplitPane viewer = new PanelWithSplitPane();
toolWindow.getComponent().add(panel);
新版本:
PanelWithSplitPane viewer = new PanelWithSplitPane();
final ContentFactory contentFactory = toolWindow.getContentManager().getFactory();
final Content content = contentFactory.createContent(viewer, "", true);
toolWindow.getContentManager().addContent(content);
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