gridlayouttab.java

很好的学习swt的 sample 很好的学习swt的 sample

	/**
	 * Creates the example layout.
	 */
	void createLayout () {
		gridLayout = new GridLayout ();
		layoutComposite.setLayout (gridLayout);
	}
	
	/** 
	 * Disposes the editors without placing their contents
	 * into the table.
	 */
	void disposeEditors () {
		comboEditor.setEditor (null, null, -1);
		combo.dispose ();
		widthText.dispose ();
		heightText.dispose ();
		hAlign.dispose ();
		vAlign.dispose ();
		hIndent.dispose ();
		hSpan.dispose ();
		vSpan.dispose ();
		hGrab.dispose ();
		vGrab.dispose ();
	}
	
	/**
	 * Generates code for the example layout.
	 */	
	StringBuffer generateLayoutCode () {
		StringBuffer code = new StringBuffer ();
		code.append ("\t\tGridLayout gridLayout = new GridLayout ();\n");
		if (gridLayout.numColumns != 1) {
			code.append ("\t\tgridLayout.numColumns = " + gridLayout.numColumns + ";\n");
		}
		if (gridLayout.makeColumnsEqualWidth) {
			code.append ("\t\tgridLayout.makeColumnsEqualWidth = true;\n");
		}
		if (gridLayout.marginHeight != 5) {
			code.append ("\t\tgridLayout.marginHeight = " + gridLayout.marginHeight + ";\n");
		}
		if (gridLayout.marginWidth != 5) {
			code.append ("\t\tgridLayout.marginWidth = " + gridLayout.marginWidth + ";\n");
		}
		if (gridLayout.horizontalSpacing != 5) {
			code.append ("\t\tgridLayout.horizontalSpacing = " + gridLayout.horizontalSpacing + ";\n");
		}
		if (gridLayout.verticalSpacing != 5) {
			code.append ("\t\tgridLayout.verticalSpacing = " + gridLayout.verticalSpacing + ";\n");
		}
		code.append ("\t\tshell.setLayout (gridLayout);\n");
		
		boolean first = true;
		for (int i = 0; i < children.length; i++) {
			Control control = children [i];
			code.append (getChildCode (control, i));
			GridData data = (GridData) control.getLayoutData ();
			if (data != null) {
				code.append ("\t\t");
				if (first) {
					code.append ("GridData ");
					first = false;
				}
				code.append ("data = new GridData ();\n");	
				if (data.widthHint != SWT.DEFAULT) {
					code.append ("\t\tdata.widthHint = " + data.widthHint + ";\n");
				}
				if (data.heightHint != SWT.DEFAULT) {
					code.append ("\t\tdata.heightHint = " + data.heightHint + ";\n");
				}
				if (data.horizontalAlignment != GridData.BEGINNING) {
					String alignment;
					int hAlignment = data.horizontalAlignment;
					if (hAlignment == GridData.CENTER) alignment = "GridData.CENTER";
					else if (hAlignment == GridData.END) alignment = "GridData.END";
					else alignment = "GridData.FILL";
					code.append ("\t\tdata.horizontalAlignment = " + alignment + ";\n");
				}
				if (data.verticalAlignment != GridData.CENTER) {
					String alignment;
					int vAlignment = data.verticalAlignment;
					if (vAlignment == GridData.BEGINNING) alignment = "GridData.BEGINNING";
					else if (vAlignment == GridData.END) alignment = "GridData.END";
					else alignment = "GridData.FILL";
					code.append ("\t\tdata.verticalAlignment = " + alignment + ";\n");
				}	
				if (data.horizontalIndent != 0) {
					code.append ("\t\tdata.horizontalIndent = " + data.horizontalIndent + ";\n");
				}
				if (data.horizontalSpan != 1) {
					code.append ("\t\tdata.horizontalSpan = " + data.horizontalSpan + ";\n");
				}
				if (data.verticalSpan != 1) {
					code.append ("\t\tdata.verticalSpan = " + data.verticalSpan + ";\n");
				}
				if (data.grabExcessHorizontalSpace) {
					code.append ("\t\tdata.grabExcessHorizontalSpace = true;\n");
				}
				if (data.grabExcessVerticalSpace) {
					code.append ("\t\tdata.grabExcessVerticalSpace = true;\n");
				}
				if (code.substring (code.length () - 33).equals ("GridData data = new GridData ();\n")) {
					code.delete (code.length () - 33, code.length ());
					first = true;
				} else if (code.substring (code.length () - 24).equals ("data = new GridData ();\n")) { 
					code.delete (code.length () - 24, code.length ());
				} else {	
					code.append ("\t\t" + names [i] + ".setLayoutData (data);\n");
				}
			}
		}
		return code;
	}
	
	/**
	 * Returns the layout data field names.
	 */
	String [] getLayoutDataFieldNames() {
		return new String [] {
			"",
			"Control", 
			"width", 
			"height", 
			"horizontalAlignment", 
			"verticalAlignment", 
			"horizontalIndent", 
			"horizontalSpan",
			"verticalSpan", 
			"grabExcessHorizontalSpace", 
			"grabExcessVerticalSpace"
		};
	}
	
	/**
	 * Gets the text for the tab folder item.
	 */
	String getTabText () {
		return "GridLayout";
	}
	
	/**
	 * Takes information from TableEditors and stores it.
	 */
	void resetEditors () {
		resetEditors (false);
	}
	
	void resetEditors (boolean tab) {
		TableItem oldItem = comboEditor.getItem ();
		if (oldItem != null) {
			int row = table.indexOf (oldItem);
			try {
				new Integer (widthText.getText ()).intValue ();
			} catch (NumberFormatException e) {
				widthText.setText (oldItem.getText (WIDTH_COL));
			}
			try {
				new Integer (heightText.getText ()).intValue ();
			} catch (NumberFormatException e) {
				heightText.setText (oldItem.getText (HEIGHT_COL));
			}
			try {
				new Integer (hIndent.getText ()).intValue ();
			} catch (NumberFormatException e) {
				hIndent.setText (oldItem.getText (HINDENT_COL));
			}
			try {
				new Integer (hSpan.getText ()).intValue ();
			} catch (NumberFormatException e) {
				hSpan.setText (oldItem.getText (HSPAN_COL));
			}
			try {
				new Integer (vSpan.getText ()).intValue ();
			} catch (NumberFormatException e) {
				vSpan.setText (oldItem.getText (VSPAN_COL));
			}
			String [] insert = new String [] {
				String.valueOf (row), combo.getText (), widthText.getText (), heightText.getText (),
				hAlign.getText (), vAlign.getText (), hIndent.getText (), 
				hSpan.getText (), vSpan.getText (), hGrab.getText (), vGrab.getText ()
			};
			data.setElementAt (insert, row);
			for (int i = 0; i < TOTAL_COLS; i++) {
				oldItem.setText (i, ((String [])data.elementAt (row)) [i]);
			}
			if (!tab) disposeEditors ();
		}
		setLayoutState ();		
		refreshLayoutComposite ();
		setLayoutData ();
		layoutComposite.layout (true);
		layoutGroup.layout (true);
	}	
	
	/**
	 * Sets the layout data for the children of the layout.
	 */
	void setLayoutData () {
		Control [] children = layoutComposite.getChildren ();
		TableItem [] items = table.getItems ();
		GridData data;
		int hIndent, hSpan, vSpan;
		String vAlign, hAlign, vGrab, hGrab;
		for (int i = 0; i < children.length; i++) {
			data = new GridData ();
			/* Set widthHint and heightHint */
			data.widthHint = new Integer (items [i].getText (WIDTH_COL)).intValue ();
			data.heightHint = new Integer (items [i].getText (HEIGHT_COL)).intValue ();
			/* Set vertical alignment and horizontal alignment */
			hAlign = items [i].getText (HALIGN_COL);
			if (hAlign.equals ("CENTER")) {
				data.horizontalAlignment = GridData.CENTER;
			} else if (hAlign.equals ("END")) {
				data.horizontalAlignment = GridData.END;
			} else if (hAlign.equals ("FILL")) {
				data.horizontalAlignment = GridData.FILL;
			} else {
				data.horizontalAlignment = GridData.BEGINNING;
			}
			vAlign = items [i].getText (VALIGN_COL);
			if (vAlign.equals ("BEGINNING")) {
				data.verticalAlignment = GridData.BEGINNING;
			} else if (vAlign.equals ("END")) {
				data.verticalAlignment = GridData.END;
			} else if (vAlign.equals ("FILL")) {
				data.verticalAlignment = GridData.FILL;
			} else {
				data.verticalAlignment = GridData.CENTER;
			}
			/* Set indents and spans */
			hIndent = new Integer (items [i].getText (HINDENT_COL)).intValue ();
			data.horizontalIndent = hIndent;
			hSpan = new Integer (items [i].getText (HSPAN_COL)).intValue ();
			data.horizontalSpan = hSpan;
			vSpan = new Integer (items [i].getText (VSPAN_COL)).intValue ();
			data.verticalSpan = vSpan;
			/* Set grabbers */
			hGrab = items [i].getText (HGRAB_COL);
			if (hGrab.equals ("true")) {
				data.grabExcessHorizontalSpace = true;
			} else {
				data.grabExcessHorizontalSpace = false;
			}
			vGrab = items [i].getText (VGRAB_COL);
			if (vGrab.equals ("true")) {
				data.grabExcessVerticalSpace = true;
			} else {
				data.grabExcessVerticalSpace = false;
			}
			children [i].setLayoutData (data);
		}
	}
	
	/**
	 * Sets the state of the layout.
	 */
	void setLayoutState () {
		/* Set the columns for the layout */
		try {
			gridLayout.numColumns = new Integer (numColumns.getText ()).intValue ();
		} catch (NumberFormatException e) {
			gridLayout.numColumns = 1;
		}
		gridLayout.makeColumnsEqualWidth = makeColumnsEqualWidth.getSelection ();
		
		/* Set the margins and spacing */
		try {
			gridLayout.marginHeight = new Integer (marginHeight.getText ()).intValue ();
		} catch (NumberFormatException e) {
			gridLayout.marginHeight = 5;
			marginHeight.select (2);
		}
		try {
			gridLayout.marginWidth = new Integer (marginWidth.getText ()).intValue ();
		} catch (NumberFormatException e) {
			gridLayout.marginWidth = 5;
			marginWidth.select (2);
		}
		try {
			gridLayout.horizontalSpacing = new Integer (horizontalSpacing.getText ()).intValue ();
		} catch (NumberFormatException e) {
			gridLayout.horizontalSpacing = 5;
			horizontalSpacing.select (2);
		}
		try {
			gridLayout.verticalSpacing = new Integer (verticalSpacing.getText ()).intValue ();
		} catch (NumberFormatException e) {
			gridLayout.verticalSpacing = 5;
			verticalSpacing.select (2);
		}
	}
}