Attachment 45177 Details for Bug 22261 – Tristate check box

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Tristate check box

TristateButton.java (text/plain), 3.51 KB, created by Klaus Wenger

on 2006-06-23 10:41:48 EDT

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Creator: Klaus Wenger

Created: 2006-06-23 10:41:48 EDT

Size: 3.51 KB

patch

obsolete

>/**
> * Created Jun 22, 2006
> */
>package com.u14n.ui.controls;
>
>import org.eclipse.swt.SWT;
>import org.eclipse.swt.internal.win32.OS;
>import org.eclipse.swt.widgets.Button;
>import org.eclipse.swt.widgets.Composite;
>
>/**
> * @author <a href="mailto:klaus.wenger@u14n.com?subject=com.u14n.ui.controls.TristateButton">Klaus Wenger</a>
> */
>public class TristateButton extends Button {
>    /**
>     * @param parent
>     * @param style
>     */
>    public TristateButton(Composite parent, int style) {
>        super(parent, style);
>    }
>    /**
>     * @see org.eclipse.swt.widgets.Widget#checkSubclass()
>     */
>    @Override
>    protected void checkSubclass () {
>        // Forcing permitted subclassing
>    }
>    @Override
>    protected void checkWidget() {
>        super.checkWidget();
>        int bits = OS.GetWindowLong(handle, OS.GWL_STYLE);
>                                                                                //System.out.println(getClass().getName() + ".checkWidget() (bits & OS.BS_CHECKBOX)=" + (bits & OS.BS_CHECKBOX)); //$NON-NLS-1$
>                                                                                //System.out.println(getClass().getName() + ".checkWidget() (bits & OS.WS_TABSTOP)=" + (bits & OS.WS_TABSTOP)); //$NON-NLS-1$
>                                                                                //System.out.println(getClass().getName() + ".checkWidget() (bits & BS_3STATE)=" + (bits & BS_3STATE)); //$NON-NLS-1$
>                                                                                //System.out.println(getClass().getName() + ".checkWidget() (bits & BS_AUTO3STATE)=" + (bits & BS_AUTO3STATE)); //$NON-NLS-1$
>        bits |= BS_3STATE;
>        bits &= ~OS.BS_CHECKBOX;
>        OS.SetWindowLong(handle, OS.GWL_STYLE, bits);
>    }
>    /**
>     * @param grayed
>     */
>    public void setGrayed(boolean grayed) {
>                                                                                System.out.println(getClass().getName() + ".setGrayed() grayed=" + grayed); //$NON-NLS-1$
>        checkWidget ();
>        if ((getStyle() & SWT.CHECK) == 0) return;
>        int flags = grayed ? BST_INDETERMINATE
>            : getSelection() ? OS.BST_CHECKED : OS.BST_UNCHECKED;
>                                                                                System.out.println(getClass().getName() + ".setGrayed() flags=" + flags); //$NON-NLS-1$
>       /*
>        * Feature in Windows. When BM_SETCHECK is used
>        * to set the checked state of a radio or check
>        * button, it sets the WM_TABSTOP style. This
>        * is undocumented and unwanted. The fix is
>        * to save and restore the window style bits.
>        */
>        int bits = OS.GetWindowLong(handle, OS.GWL_STYLE);
>        OS.SendMessage(handle, OS.BM_SETCHECK, flags, 0);
>        OS.SetWindowLong(handle, OS.GWL_STYLE, bits);     
>    }
>    /**
>     * @return <code>true</code>, if greyed, else <code>false</code>
>     */
>    public boolean getGrayed() {
>        checkWidget ();
>        if ((getStyle() & SWT.CHECK) == 0) return false;
>        int state = OS.SendMessage(handle, OS.BM_GETCHECK, 0, 0);
>                                                                                System.out.println(getClass().getName() + ".getGrayed() state=" + state); //$NON-NLS-1$
>        return (state & BST_INDETERMINATE) != 0;
>    }
>
>    private static final int BS_3STATE = 0x00000005;
>    private static final int BS_AUTO3STATE = 0x00000006;
>    private static final short BST_INDETERMINATE = 0x0002;
>}

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Attachments on bug 22261: 27940 | 27941 | 27942 | 45177 | 65176 | 65206