我有一个带有三列布局的 Eclipse RCP 应用程序:



编辑区在最右边。现在，当您收到 IPageLayout要使用，编辑器区域已经添加进去了。这很好:我们在编辑器的左侧添加区域 B，在 B 的左侧添加区域 A，布局正是我们需要的。

问题是，当您在 A 和 B 之间移动窗框时， View A 和 B 会更改而不调整编辑器区域的大小(很好；)但是当您在 B 和编辑器区域之间移动另一个窗框时，所有三个 View 都会调整大小；布局管理器的作用是保持 A 和 B 的宽度比例，这不是我们想要的。我们希望用户能够独立移动每个窗扇，并且只影响它接触的两个 View 。

看起来这个问题的根本原因是当你拿到 IPageView 时编辑器就位。 ，因此您必须定位 IFolderLayout s 相对于它。如果您可以相对于 B 定位编辑器，那么调整大小会做正确的事情。

所以我的问题:

最佳答案

我知道没有办法改变 IPageLayout 的布局树在 Eclipse 3.x 中。然而，在 Eclipse 4.2 中，应用程序模型可以在运行时动态更改。

因此，如果您考虑将应用程序迁移到 Eclipse 4，则此解决方案可能是一种选择。为了尽可能保持原始应用程序和 UI 代码不变，此解决方案将

import org.eclipse.ui.IPageLayout;
import org.eclipse.ui.IPerspectiveFactory;

public class Perspective implements IPerspectiveFactory {

  public static final String ID = "wag.perspective";

  public void createInitialLayout(IPageLayout layout) {
    String editorArea = layout.getEditorArea();
    layout.setEditorAreaVisible(true);

    layout.addStandaloneView(AView.ID, false, IPageLayout.LEFT,
                             0.25f, editorArea);
    layout.addStandaloneView(BView.ID, false, IPageLayout.LEFT,
                             0.25f, editorArea);

    layout.getViewLayout(AView.ID).setCloseable(false);
    layout.getViewLayout(BView.ID).setCloseable(false);
  }
}

<extension
  id="id1"
  point="org.eclipse.e4.workbench.model">
  <fragment
    uri="fragment.e4xmi">
  </fragment>
</extension>

package wag.contribution.addons;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.inject.Inject;

import org.eclipse.e4.core.services.events.IEventBroker;
import org.eclipse.e4.ui.model.application.MApplication;
import org.eclipse.e4.ui.model.application.ui.MElementContainer;
import org.eclipse.e4.ui.model.application.ui.MUIElement;
import org.eclipse.e4.ui.model.application.ui.advanced.MPlaceholder;
import org.eclipse.e4.ui.workbench.modeling.EModelService;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventHandler;

public class LayoutSorter {

  @Inject private IEventBroker broker;

  private EventHandler handler;

  // The part IDs we are interested in, sorted in the sequence they should be
  // shown
  private static List<String> PART_IDS = Arrays.asList(new String[] {
              "wag.aView", "wag.bView", "org.eclipse.ui.editorss" });

  // Listen to the e4 core service's event broker to find the magical time
  // when the application is created and try to sort the layout.
  @PostConstruct
  void hookListeners(final MApplication application,
                     final EModelService service) {

    if (handler == null) {
      handler = new EventHandler() {
        // Try to sort the layout. Unsubscribe from event broker if
        // successful.
        @Override
        public void handleEvent(Event event) {
          try {
            sort(application, service);
            // sort did finish: stop listening to the broker.
            broker.unsubscribe(handler);
          } catch (Exception e) {
            // Something went wrong, the application model was not ready yet.
            // Keep on listening.
          }
        }
      };

      // Subscribe "ServiceEvent.MODIFIED" to grab the application.STARTED
      // event. Does anybody know how to do this in a better way?
      broker.subscribe("org/osgi/framework/ServiceEvent/MODIFIED",
                       handler);
    }
  }

  private void sort(MApplication application, EModelService service) {

    // find all placeholders
    List<MPlaceholder> placeholders = service.findElements(application,
              null, MPlaceholder.class, null);

    // only keep the ones we are interested in
    for (int i = placeholders.size() - 1; i > -1; i--) {
      if (!PART_IDS.contains(placeholders.get(i).getElementId())) {
        placeholders.remove(i);
      }
    }

    // find the parents of the placeholders
    List<MElementContainer<MUIElement>> parents = new ArrayList<>(
             placeholders.size());
    for (MPlaceholder placeholder : placeholders) {
      parents.add(placeholder.getParent());
    }

    // find the parent that is "deepest down" in the tree
    MElementContainer<MUIElement> targetParent = null;
    for (MElementContainer<MUIElement> parent : parents) {
      for (MUIElement child : parent.getChildren()) {
        if (parents.contains(child)) {
          continue;
        }
        targetParent = parent;
      }
    }

    // move all parts to the target parent
    if (targetParent != null) {
      for (int i = 0; i < placeholders.size(); i++) {
        if (targetParent != placeholders.get(i).getParent()) {
          service.move(placeholders.get(i), targetParent, i);
        }
      }
    }
  }

  @PreDestroy
  void unhookListeners() {
    if (handler != null) {
      // in case it wasn't unhooked earlier
      broker.unsubscribe(handler);
    }
  }
}

关于java - Eclipse RCP IPageLayout 问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11891387/