Attachment #130832 for bug #193064

Lines 202-207 Link Here

(-)Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/CTabFolder.java (-1 / +45 lines)
202	// on Resize	202	// on Resize
203	Point oldSize;	203	Point oldSize;
204	Font oldFont;	204	Font oldFont;
		205	CTabFolderPageManager pageManager;
205		206
206	// internal constants	207	// internal constants
207	static final int DEFAULT_WIDTH = 64;	208	static final int DEFAULT_WIDTH = 64;
Lines 555-560 Link Here
555	color.dispose();	556	color.dispose();
556	}	557	}
557	}	558	}
		559	boolean canLeaveThePage(int oldIndex, int newIndex) {
		560	if (pageManager != null) {
		561	return pageManager.canLeaveThePage(oldIndex, newIndex);
		562	}
		563	return true;
		564	}
558	/*	565	/*
559	* This class was not intended to be subclassed but this restriction	566	* This class was not intended to be subclassed but this restriction
560	* cannot be enforced without breaking backward compatibility.	567	* cannot be enforced without breaking backward compatibility.
Lines 1416-1421 Link Here
1416	checkWidget();	1423	checkWidget();
1417	return mru;	1424	return mru;
1418	}	1425	}
		1426	/**
		1427	* Returns the Page Manager that is used by the <code>CTabfolder</code> before switching between tab-items.
		1428	*
		1429	* @return the tabfolder's Page Manager, or null if no Page Manager has been set.
		1430	*
		1431	* @since 3.6
		1432	*/
		1433	public CTabFolderPageManager getPageManager() {
		1434	return pageManager;
		1435	}
1419	int getRightItemEdge (){	1436	int getRightItemEdge (){
1420	int x = getSize().x - borderRight - 3;	1437	int x = getSize().x - borderRight - 3;
1421	if (showMin) x -= BUTTON_SIZE;	1438	if (showMin) x -= BUTTON_SIZE;
Lines 3185-3190 Link Here
3185	}	3202	}
3186	}	3203	}
3187	/**	3204	/**
		3205	* Sets the Page Manager that will be used to by the <code>CTabFolder</code> before
		3206	* switching between tab-items.
		3207	* The Page Manager should implement the <code>CTabFolderPageManager</code> and
		3208	* implement the method <code>canLeaveThePage</code>.
		3209	*
		3210	* @param pageManager the Page Manager for the <code>CTabFolder</code>
		3211	*
		3212	* @exception IllegalArgumentException <ul>
		3213	* <li>ERROR_INVALID_RANGE - if the index is out of range</li>
		3214	* </ul>
		3215	*
		3216	* @exception SWTException <ul>
		3217	* <li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread</li>
		3218	* <li>ERROR_WIDGET_DISPOSED when the widget has been disposed</li>
		3219	* </ul>
		3220	*
		3221	* @since 3.6
		3222	*/
		3223	public void setPageManager(CTabFolderPageManager pageManager) {
		3224	this.pageManager = pageManager;
		3225	}
		3226	/**
3188	* Set the selection to the tab at the specified item.	3227	* Set the selection to the tab at the specified item.
3189	*	3228	*
3190	* @param item the tab item to be selected	3229	* @param item the tab item to be selected
Lines 3222-3228 Link Here
3222	showItem(selection);	3261	showItem(selection);
3223	return;	3262	return;
3224	}	3263	}
3225		3264	/*
		3265	* If the user has set a Page Manager for the previously selected tab-item,
		3266	* then call the canLeaveThePage() method to do any validations in the Page Manager,
		3267	* before switching the tab. Don't change the tab selection if validation fails.
		3268	*/
		3269	if (selectedIndex != -1 && !canLeaveThePage(selectedIndex, index)) return;
3226	int oldIndex = selectedIndex;	3270	int oldIndex = selectedIndex;
3227	selectedIndex = index;	3271	selectedIndex = index;
3228	if (oldIndex != -1) {	3272	if (oldIndex != -1) {




package org.eclipse.swt.custom;

/**
 * This is an Interface which provides a mechanism to use a Page Manager for a <code>CTabItem</code>.
 * The Page Manager can be used to do any validations as required by the user while switching between tab-items.
 * The Page Manager should implement the method <code>canLeaveThePage</code>.
 */

public interface CTabFolderPageManager {
    /**
     * This method is called before changing the tab selection of the <code>CTabFolder</code>
     *  
     * @param oldIndex is index of tab selected in the <code>CTabFolder</code>
     * @param newIndex is index of the tab that will be selected if this method returns true
     * 
     * @return <ul>
     * <li><code>true</code> if the tab selection should be changed from <code>oldIndex</code>
     * to <code>newIndex</code></li>
     * <li><code>false</code> if the tab selection should not be changed.</li>
     * </ul>
     * 
     * @since 3.6
     */
    public boolean canLeaveThePage(int oldIndex, int newIndex);
}

Return to bug 193064

Added Link Here

(-)Eclipse (+25 lines)
1	package org.eclipse.swt.custom;
2
3	/**
4	* This is an Interface which provides a mechanism to use a Page Manager for a <code>CTabItem</code>.
5	* The Page Manager can be used to do any validations as required by the user while switching between tab-items.
6	* The Page Manager should implement the method <code>canLeaveThePage</code>.
7	*/
8
9	public interface CTabFolderPageManager {
10	/**
11	* This method is called before changing the tab selection of the <code>CTabFolder</code>
12	*
13	* @param oldIndex is index of tab selected in the <code>CTabFolder</code>
14	* @param newIndex is index of the tab that will be selected if this method returns true
15	*
16	* @return <ul>
17	* <li><code>true</code> if the tab selection should be changed from <code>oldIndex</code>
18	* to <code>newIndex</code></li>
19	* <li><code>false</code> if the tab selection should not be changed.</li>
20	* </ul>
21	*
22	* @since 3.6
23	*/
24	public boolean canLeaveThePage(int oldIndex, int newIndex);
25	}