java - 在 ScrolledComposite 中调整扩展栏 SWT 的大小

Question

我正在构建一个 java SWT 独立应用程序，在滚动复合 Material 中带有展开栏。在某些时候，我会向其中一个组件添加一个字段。因此，该项目的大小将会增加。首先，我销毁展开栏中的所有当前项目:

 public void closeAll(){
    for(int a = bar.getItemCount()-1; a>=0; a--){
        bar.getItem(a).getControl().dispose();
        bar.getItem(a).dispose();
    }
}

然后我将再次重新添加它们(我将复合 Material 存储在其他地方)。我重新计算每个项目的高度:

for(int a = 0; a<bar.getItemCount(); a++){
        bar.getItem(a).setHeight(bar.getItem(a).getControl().computeSize(SWT.DEFAULT, SWT.DEFAULT).y);

    }

当我完成这一切时，滚动的复合 Material 将不会进一步向下滚动(展开栏的一部分现在位于 ScrolledComposite 的客户区域之外)。

当我调整窗口本身的大小时，所有问题都解决了。那么，我如何在没有代码的情况下强制执行通常与调整窗口大小相关的更新呢？

先谢谢大家了!

//编辑

我已经添加了我正在谈论的类(class):

public class InputPanel extends Panel implements Refresh{

private Editor parent;
private ExpandBar expandBar;

private ArrayList<InputBlock> blocks;
public ScrolledComposite scroll;



public InputPanel(Editor parent, Composite panel) {
    super(panel);
    this.parent = parent;
    setGridLayout(0,0,1);
    blocks = new ArrayList<InputBlock>();
    init();
}
private void init(){
    //two pannels first button pannel
    Panel buttonPanel = new Panel(new Composite(panel, SWT.BORDER));
    buttonPanel.setGridLayout(0, 0, 3);
    buttonPanel.fillGridData();

    Composite barComp = new Composite(panel, SWT.BORDER);

    barComp.setLayout(new FillLayout());
    GridData data1 = new GridData();
    data1.grabExcessHorizontalSpace = true;
    data1.horizontalAlignment = SWT.FILL;
    data1.verticalAlignment = SWT.FILL;
    barComp.setLayoutData(data1);

    scroll = new ScrolledComposite(barComp, SWT.V_SCROLL);
    expandBar = new ExpandBar(scroll, SWT.None);
    GridData data = new GridData();
    data.grabExcessHorizontalSpace = true;
    data.grabExcessVerticalSpace = true;
    data.horizontalAlignment = SWT.FILL;
    data.verticalAlignment = SWT.TOP;

    scroll.setContent(expandBar);
    scroll.setExpandVertical(true);
    scroll.setExpandHorizontal(true);
    scroll.setAlwaysShowScrollBars(true);
    for(int a = 0; a<Main.database.size(); a++){
        Composite composite = new Composite(expandBar, SWT.BORDER);
        blocks.add(new InputBlock(this, composite, Main.database.get(a)));
        addItem(composite, Main.database.get(a).name);
    }
    refreshHeights();
    scroll.setMinSize(expandBar.computeSize(SWT.DEFAULT, SWT.DEFAULT));
    scroll.layout(true);
}
public void addItem(Composite composite, String tabName){
    ExpandItem expandItem = new ExpandItem(expandBar, SWT.None);
    expandItem.setText(tabName);
    expandItem.setControl(composite);
    expandItem.setExpanded(true);
    composite.setVisible(true);
}
public void refreshHeights(){
    for(int a = 0; a<expandBar.getItemCount(); a++){
        expandBar.getItem(a).setHeight(expandBar.getItem(a).getControl().computeSize(SWT.DEFAULT, SWT.DEFAULT).y);
    }

}
public void closeAll(){
    ExpandItem[] items = expandBar.getItems();
    System.out.println(items.length);

    for(int a = items.length-1; a>=0; a--){
        items[a].getControl().dispose();
        items[a].dispose();
    }
}


public void refresh(){
    closeAll();
    blocks = new ArrayList<InputBlock>();
    for(int a = 0; a<Main.database.size(); a++){
        Composite composite = new Composite(expandBar, SWT.BORDER);
        blocks.add(new InputBlock(this, composite, Main.database.get(a)));
        addItem(composite, Main.database.get(a).name);
    }
    refreshHeights();
    scroll.setMinSize(expandBar.computeSize(SWT.DEFAULT, SWT.DEFAULT));
    scroll.layout(true);
}

public Editor getParent(){
    return parent;
}


public void setEditorMenu(boolean show){
    for(int a = 0; a<blocks.size(); a++){
        blocks.get(a).setEditorMenu(show);
    }
}



public ArrayList<InputBlock> getBlocks(){
    return blocks;
}
public boolean setValue(DatabaseField field, String value){
    value = value.trim();
    for(int a = 0; a<blocks.size(); a++){
        if(blocks.get(a).setValue(field, value)){
            return true;
        }
    }
    return false;
}

}

我试图制作一个示例，但是该示例是开箱即用的。我看不出有什么区别。 InputBlocks 是保存有关组合中所需字段的数据的类，如果调用它们将生成组合。

持有 ScrolledComposite 的复合 Material 当前为 SashForm，我不知道这是否会产生任何影响？

我收到此错误(仅在 Linux 上)，但在我尝试的示例中没有:

SWT:12455): Gtk-CRITICAL **: IA__gtk_widget_map: assertion `gtk_widget_get_visible (widget)' failed
(SWT:12455): Gtk-CRITICAL **: IA__gtk_widget_map: assertion `gtk_widget_get_visible (widget)' failed
(SWT:12455): Gtk-CRITICAL **: IA__gtk_widget_map: assertion `gtk_widget_get_visible (widget)' failed

更新

我为我的问题做了一个更好的例子。此代码正在运行并为我生成相同的错误:

(SWT:6765): Gtk-CRITICAL **: IA__gtk_widget_map: assertion `gtk_widget_get_visible (widget)' failed

我使用过这段代码:

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CTabFolder;
import org.eclipse.swt.custom.CTabItem;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.ExpandBar;
import org.eclipse.swt.widgets.ExpandItem;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;


 public class ExpandBarExample implements SelectionListener{



public static void main(String[] args){
    Display display = new Display();
    Shell shell = new Shell(display);
    new ExpandBarExample(shell);
    shell.setMaximized(true);
    shell.setLayout(new FillLayout());
    shell.open();

    while(!shell.isDisposed()){
        if(!display.readAndDispatch()){
            display.sleep();
        }
    }
    display.dispose();
}

private  ExpandBar bar;
private  ScrolledComposite scroll;
private  Composite composite;
private SashForm sash;
private CTabFolder folder;
private Button button;

public ExpandBarExample(Composite composite){
    this.composite = composite;

    init();
}
public void init(){


    composite.setLayout(new FillLayout());
    sash = new SashForm(composite, SWT.VERTICAL);

    folder = new CTabFolder(sash, SWT.None);


    scroll = new ScrolledComposite(folder, SWT.V_SCROLL);
    GridData data = new GridData();
    data.grabExcessHorizontalSpace = true;
    data.grabExcessVerticalSpace = true;

    bar = new ExpandBar(scroll, SWT.NONE);
    scroll.setContent(bar);
    scroll.setExpandVertical(true);
    scroll.setExpandHorizontal(true);
    scroll.setAlwaysShowScrollBars(true);



    CTabItem tab = new CTabItem(folder, SWT.None);
    tab.setControl(scroll);
    tab.setText("TEST");

    Composite sashFill = new Composite(sash, SWT.BORDER);
    sashFill.setLayout(new FillLayout());
    button = new Button(sashFill, SWT.PUSH);
    button.addSelectionListener(this);
    button.setText("Add block");

    sash.setWeights(new int[]{3,1});

    for(int a = 0; a<10; a++){
        Composite composite = new Composite(bar, SWT.BORDER);

        composite.setLayout(new GridLayout(2, false));

        for(int b = 0; b<10; b++){
            Label label = new Label(composite, SWT.BORDER);
            label.setText("TEST");
        }

        addItem(composite, "Item " + a);
    }
    computeHeights();
    scroll.setMinSize(bar.computeSize(SWT.DEFAULT, SWT.DEFAULT));
    scroll.layout(true);



    //delete old panels
    removeAll();
    //trying to add more panels

    for(int a = 0; a<10; a++){
        Composite composite = new Composite(bar, SWT.BORDER);


        composite.setLayout(new GridLayout(2, false));

        for(int b = 0; b<20; b++){
            Label label = new Label(composite, SWT.BORDER);
            label.setText("TEST");
        }

        addItem(composite, "Item " + a);
    }


    computeHeights();
    scroll.setMinSize(bar.computeSize(SWT.DEFAULT, SWT.DEFAULT));
    scroll.layout(true);

}
public void refresh(){

}
public void removeAll(){
    ExpandItem[] items = bar.getItems();
    System.out.println(items.length);

    for(int a = items.length-1; a>=0; a--){
        items[a].getControl().dispose();
        items[a].dispose();
    }
}
public void addItem(Composite composite, String tabName){
    ExpandItem expandItem = new ExpandItem(bar, SWT.None);
    expandItem.setText(tabName);
    expandItem.setControl(composite);
    expandItem.setExpanded(true);
}
public void computeHeights(){
    for(int a = 0; a<bar.getItemCount(); a++){
        bar.getItem(a).setHeight(bar.getItem(a).getControl().computeSize(SWT.DEFAULT, SWT.DEFAULT).y);
    }
}
@Override
public void widgetSelected(SelectionEvent e) {
    if(e.getSource() == button){
        Composite comp = new Composite(bar, SWT.BORDER);
        comp.setLayout(new GridLayout(2, false));
        for(int a = 0; a<10; a++){
            Label label = new Label(comp, SWT.BORDER);
            label.setText("TEST");
        }
        comp.layout(true);
        addItem(comp, "ADDED");
        computeHeights();

        scroll.setMinSize(bar.computeSize(SWT.DEFAULT, SWT.DEFAULT, true));

        scroll.layout(true, true);
    }

}
@Override
public void widgetDefaultSelected(SelectionEvent e) {
    // TODO Auto-generated method stub

}

}

我尝试在 Ubuntu 和 OpenSuse 上运行它，两者都给出相同的 Gtk 错误。我希望有人能帮助我!

Answer 1

实际上 1 毫秒就足够了!

expandBar.addExpandListener(new ExpandAdapter() {
        @Override
        public void itemExpanded(ExpandEvent e) {
            resetScrolledCompositeMinSize();
        }
        @Override
        public void itemCollapsed(ExpandEvent e) {
            resetScrolledCompositeMinSize();
        }
        private void resetScrolledCompositeMinSize() {
            Display.getDefault().timerExec(1, new Runnable() //1 ms is more than enough!!
            {
                @Override
                public void run()
                {
                    scrolledComposite.setMinSize(expandBar.computeSize(SWT.DEFAULT, SWT.DEFAULT));
                }
            });
        }
    });