Change package of non-JCR SWT components.

[lgpl/argeo-commons.git] / eclipse / org.argeo.cms.swt / src / org / argeo / cms / swt / widgets / ContextOverlay.java

diff --git a/eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/ContextOverlay.java b/eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/ContextOverlay.java
new file mode 100644 (file)
index 0000000..f7b6443
--- /dev/null
+++ b/eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/ContextOverlay.java
@@ -0,0 +1,113 @@
+package org.argeo.cms.swt.widgets;
+
+import org.argeo.cms.swt.CmsSwtUtils;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.ShellAdapter;
+import org.eclipse.swt.events.ShellEvent;
+import org.eclipse.swt.graphics.Point;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.Shell;
+
+/**
+ * Manages a lightweight shell which is related to a {@link Control}, typically
+ * in order to reproduce a dropdown semantic, but with more flexibility.
+ */
+public class ContextOverlay extends ScrolledPage {
+       private static final long serialVersionUID = 6702077429573324009L;
+
+//     private Shell shell;
+       private Control control;
+
+       private int maxHeight = 400;
+
+       public ContextOverlay(Control control, int style) {
+               super(createShell(control, style), SWT.NONE);
+               Shell shell = getShell();
+               setLayoutData(CmsSwtUtils.fillAll());
+               // TODO make autohide configurable?
+               //shell.addShellListener(new AutoHideShellListener());
+               this.control = control;
+               control.addDisposeListener((e) -> {
+                       dispose();
+                       shell.dispose();
+               });
+       }
+
+       private static Composite createShell(Control control, int style) {
+               if (control == null)
+                       throw new IllegalArgumentException("Control cannot be null");
+               if (control.isDisposed())
+                       throw new IllegalArgumentException("Control is disposed");
+               Shell shell = new Shell(control.getShell(), SWT.NO_TRIM);
+               shell.setLayout(CmsSwtUtils.noSpaceGridLayout());
+               Composite placeholder = new Composite(shell, SWT.BORDER);
+               placeholder.setLayoutData(CmsSwtUtils.fillAll());
+               placeholder.setLayout(CmsSwtUtils.noSpaceGridLayout());
+               return placeholder;
+       }
+
+       public void show() {
+               Point relativeControlLocation = control.getLocation();
+               Point controlLocation = control.toDisplay(relativeControlLocation.x, relativeControlLocation.y);
+
+               int controlWidth = control.getBounds().width;
+
+               Shell shell = getShell();
+
+               layout(true, true);
+               shell.pack();
+               shell.layout(true, true);
+               int targetShellWidth = shell.getSize().x < controlWidth ? controlWidth : shell.getSize().x;
+               if (shell.getSize().y > maxHeight) {
+                       shell.setSize(targetShellWidth, maxHeight);
+               } else {
+                       shell.setSize(targetShellWidth, shell.getSize().y);
+               }
+
+               int shellHeight = shell.getSize().y;
+               int controlHeight = control.getBounds().height;
+               Point shellLocation = new Point(controlLocation.x, controlLocation.y + controlHeight);
+               int displayHeight = shell.getDisplay().getBounds().height;
+               if (shellLocation.y + shellHeight > displayHeight) {// bottom of page
+                       shellLocation = new Point(controlLocation.x, controlLocation.y - shellHeight);
+               }
+               shell.setLocation(shellLocation);
+
+               if (getChildren().length != 0)
+                       shell.open();
+               if (!control.isDisposed())
+                       control.setFocus();
+       }
+
+       public void hide() {
+               getShell().setVisible(false);
+               onHide();
+       }
+
+       public boolean isShellVisible() {
+               if (isDisposed())
+                       return false;
+               return getShell().isVisible();
+       }
+
+       /** to be overridden */
+       protected void onHide() {
+               // does nothing by default.
+       }
+
+       private class AutoHideShellListener extends ShellAdapter {
+               private static final long serialVersionUID = 7743287433907938099L;
+
+               @Override
+               public void shellDeactivated(ShellEvent e) {
+                       try {
+                               Thread.sleep(1000);
+                       } catch (InterruptedException e1) {
+                               // silent
+                       }
+                       if (!control.isDisposed() && !control.isFocusControl())
+                               hide();
+               }
+       }
+}