jsframelayout.java

Java自定义窗体JsFrame。简介见：http://jason0086.spaces.live.com/Blog/cns!A797D0C5C0C13C92!518.entry

	/**
	 * Invalidates the layout, 
	 * indicating that if the layout manager has cached information it should be discarded.
	 * @param target the container
	 */
	public void invalidateLayout(Container target) {
		// TODO Auto-generated method stub
		
	}

	/**
	 * Determines the maximum size of the target container using this layout manager.
	 * This method is called when a container calls its getMaximumSize method.
	 * Most applications do not call this method directly.
	 * @param target the container
	 * @return the maximum dimensions for this layout
	 */
	public Dimension maximumLayoutSize(Container target) {
		return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
	}

	/**
	 * Lays out the container argument using this js frame layout.
	 * This method actually reshapes the components in the specify container 
	 * in order to satisfy the constraints of this <code>JsFrameLayout</code> object.
	 * @param target the container
	 */
	public void layoutContainer(Container target) {
		synchronized (target.getTreeLock()) {
			Insets xIns = target.getInsets();
			int top = xIns.top;
			int bottom = target.getHeight() - xIns.bottom;
			int left = xIns.left;
			int right = target.getWidth() - xIns.right;
			// north line
			int northHeight = 0;
			int leftTemp = left;
			int rightTemp = right;
			if (northwest != null) {
				Dimension d = northwest.getPreferredSize();
				northwest.setBounds(leftTemp, top, d.width, d.height);
				leftTemp += d.width;
				northHeight = Math.max(northHeight, d.height);
			}
			if (northeast != null) {
				Dimension d = northeast.getPreferredSize();
				northeast.setBounds(rightTemp - d.width, top, d.width, d.height);
				rightTemp -= d.width;
				northHeight = Math.max(northHeight, d.height);
			}
			if (north != null) {
				Dimension d = north.getPreferredSize();
				north.setBounds(leftTemp, top, rightTemp - leftTemp, d.height);
				northHeight = Math.max(northHeight, d.height);
			}
			// south line
			int southHeight = 0;
			leftTemp = left;
			rightTemp = right;
			if (southwest != null) {
				Dimension d = southwest.getPreferredSize();
				southwest.setBounds(leftTemp, bottom - d.height, d.width, d.height);
				leftTemp += d.width;
				southHeight = Math.max(southHeight, d.height);
			}
			if (southeast != null) {
				Dimension d = southeast.getPreferredSize();
				southeast.setBounds(rightTemp - d.width, bottom - d.height, d.width, d.height);
				rightTemp -= d.width;
				southHeight = Math.max(southHeight, d.height);
			}
			if (south != null) {
				Dimension d = south.getPreferredSize();
				south.setBounds(leftTemp, bottom - d.height, rightTemp - leftTemp, d.height);
				southHeight = Math.max(southHeight, d.height);
			}
			// center line
			leftTemp = left;
			rightTemp = right;
			int topTemp = top + northHeight;
			int bottomTemp = bottom - southHeight;
			if (west != null) {
				Dimension d = west.getPreferredSize();
				west.setBounds(leftTemp, topTemp, d.width, bottomTemp - topTemp);
				leftTemp += d.width;
			}
			if (east != null) {
				Dimension d = east.getPreferredSize();
				east.setBounds(rightTemp - d.width, topTemp, d.width, bottomTemp - topTemp);
				rightTemp -= d.width;
			}
			if (title != null) {
				Dimension d = title.getPreferredSize();
				title.setBounds(leftTemp, topTemp, rightTemp - leftTemp, d.height);
				topTemp += d.height + vgap;
			}
			if (titleLine != null) {
				Dimension d = titleLine.getPreferredSize();
				titleLine.setBounds(leftTemp, topTemp, rightTemp - leftTemp, d.height);
				topTemp += d.height + vgap;
			}
			if (menu != null) {
				Dimension d = menu.getPreferredSize();
				menu.setBounds(leftTemp, topTemp, rightTemp - leftTemp, d.height);
				topTemp += d.height + vgap;
			}
			if (state != null) {
				Dimension d = state.getPreferredSize();
				state.setBounds(leftTemp, bottomTemp - d.height, rightTemp - leftTemp, d.height);
				bottomTemp -= d.height + vgap;
			}
			if (content != null) {
				content.setBounds(leftTemp, topTemp, rightTemp - leftTemp, bottomTemp - topTemp);
			}
		}
	}

	/**
	 * Determines the minimum size of the target container using this layout manager.
	 * This method is called when a container calls its getMinimumSize method.
	 * Most applications do not call this method directly.
	 * @param target the container
	 * @return the minimum size of the layout
	 */
	public Dimension minimumLayoutSize(Container target) {
		synchronized (target.getTreeLock()) {
			// north line
			Dimension northDmn = new Dimension(0, 0);
			if (northwest != null) {
				Dimension d = northwest.getMinimumSize();
				northDmn.width += d.width;
				northDmn.height = Math.max(northDmn.height, d.height);
			}
			if (northeast != null) {
				Dimension d = northeast.getMinimumSize();
				northDmn.width += d.width;
				northDmn.height = Math.max(northDmn.height, d.height);
			}
			if (north != null) {
				Dimension d = north.getMinimumSize();
				northDmn.width += d.width;
				northDmn.height = Math.max(northDmn.height, d.height);
			}
			// center line
			Dimension centerDmn = new Dimension(0, 0);
			if (west != null) {
				Dimension d = west.getMinimumSize();
				centerDmn.width += d.width;
				centerDmn.height = Math.max(centerDmn.height, d.height);
			}
			if (east != null) {
				Dimension d = east.getMinimumSize();
				centerDmn.width += d.width;
				centerDmn.height = Math.max(centerDmn.height, d.height);
			}
			int centerWidth = 0;
			int centerHeight = 0;
			if (title != null) {
				Dimension d = title.getMinimumSize();
				centerWidth = Math.max(centerWidth, d.width);
				centerHeight += d.height + vgap;
			}
			if (titleLine != null) {
				Dimension d = titleLine.getMinimumSize();
				centerWidth = Math.max(centerWidth, d.width);
				centerHeight += d.height + vgap;
			}
			if (menu != null) {
				Dimension d = menu.getMinimumSize();
				centerWidth = Math.max(centerWidth, d.width);
				centerHeight += d.height + vgap;
			}
			if (content != null) {
				Dimension d = content.getMinimumSize();
				centerWidth = Math.max(centerWidth, d.width);
				centerHeight += d.height;
			}
			if (state != null) {
				Dimension d = state.getMinimumSize();
				centerWidth = Math.max(centerWidth, d.width);
				centerHeight += d.height + vgap;
			}
			centerDmn.width += centerWidth;
			centerDmn.height = Math.max(centerDmn.height, centerHeight);
			// south line
			Dimension southDmn = new Dimension(0, 0);
			if (southwest != null) {
				Dimension d = southwest.getMinimumSize();
				southDmn.width += d.width;
				southDmn.height = Math.max(southDmn.height, d.height);
			}
			if (southeast != null) {
				Dimension d = southeast.getMinimumSize();
				southDmn.width += d.width;
				southDmn.height = Math.max(southDmn.height, d.height);
			}
			if (south != null) {
				Dimension d = south.getMinimumSize();
				southDmn.width += d.width;
				southDmn.height = Math.max(southDmn.height, d.height);
			}
			// 
			Dimension containerDmn = new Dimension(0, 0);
			containerDmn.width = Math.max(Math.max(northDmn.width, centerDmn.width), southDmn.width);
			containerDmn.height = northDmn.height + centerDmn.height + vgap + southDmn.height;
			Insets xIns = target.getInsets();
			containerDmn.width += xIns.left + xIns.right;
			containerDmn.height += xIns.top + xIns.bottom;
			return containerDmn;
		}
	}
	
	/**
	 * Determines the preferred size of the target container using this layout manager, 
	 * based on the components in the container.
	 * This method is called when a container calls its getPreferredSize method.
	 * Most applications do not call this method directly.
	 * @param target the container
	 * @return the preferred size of the layout
	 */
	public Dimension preferredLayoutSize(Container target) {
		synchronized (target.getTreeLock()) {
			// north line
			Dimension northDmn = new Dimension(0, 0);
			if (northwest != null) {
				Dimension d = northwest.getPreferredSize();
				northDmn.width += d.width;
				northDmn.height = Math.max(northDmn.height, d.height);
			}
			if (northeast != null) {
				Dimension d = northeast.getPreferredSize();
				northDmn.width += d.width;
				northDmn.height = Math.max(northDmn.height, d.height);
			}
			if (north != null) {
				Dimension d = north.getPreferredSize();
				northDmn.width += d.width;
				northDmn.height = Math.max(northDmn.height, d.height);
			}
			// center line
			Dimension centerDmn = new Dimension(0, 0);
			if (west != null) {
				Dimension d = west.getPreferredSize();
				centerDmn.width += d.width;
				centerDmn.height = Math.max(centerDmn.height, d.height);
			}
			if (east != null) {
				Dimension d = east.getPreferredSize();
				centerDmn.width += d.width;
				centerDmn.height = Math.max(centerDmn.height, d.height);
			}
			int centerWidth = 0;
			int centerHeiht = 0;
			if (title != null) {
				Dimension d = title.getPreferredSize();
				centerWidth = Math.max(centerWidth, d.width);
				centerHeiht += d.height + vgap;
			}
			if (titleLine != null) {
				Dimension d = titleLine.getPreferredSize();
				centerWidth = Math.max(centerWidth, d.width);
				centerHeiht += d.height + vgap;
			}
			if (menu != null) {
				Dimension d = menu.getPreferredSize();
				centerWidth = Math.max(centerWidth, d.width);
				centerHeiht += d.height + vgap;
			}
			if (content != null) {
				Dimension d = content.getPreferredSize();
				centerWidth = Math.max(centerWidth, d.width);
				centerHeiht += d.height;
			}
			if (state != null) {
				Dimension d = state.getPreferredSize();
				centerWidth = Math.max(centerWidth, d.width);
				centerHeiht += d.height + vgap;
			}
			centerDmn.width += centerWidth;
			centerDmn.height = Math.max(centerDmn.height, centerHeiht);
			// south line
			Dimension southDmn = new Dimension(0, 0);
			if (southwest != null) {
				Dimension d = southwest.getPreferredSize();
				southDmn.width += d.width;
				southDmn.height = Math.max(southDmn.height, d.height);
			}
			if (southeast != null) {
				Dimension d = southeast.getPreferredSize();
				southDmn.width += d.width;
				southDmn.height = Math.max(southDmn.height, d.height);
			}
			if (south != null) {
				Dimension d = south.getPreferredSize();
				southDmn.width += d.width;
				southDmn.height = Math.max(southDmn.height, d.height);
			}
			// container
			Dimension containerDmn = new Dimension(0, 0);
			containerDmn.width = Math.max(Math.max(northDmn.width, centerDmn.width), southDmn.width);
			containerDmn.height = northDmn.height + centerDmn.height + vgap + southDmn.height;
			Insets xIns = target.getInsets();
			containerDmn.width += xIns.left + xIns.right;
			containerDmn.height += xIns.top + xIns.bottom;
			return containerDmn;
		}
	}

	/**
	 * Removes the specify component from this layout.
	 * This method is called when a container calls its remove or removeAll methods.
	 * Most applications do not call this method directly.
	 * @param component the component to be removed from this layout
	 */
	public void removeLayoutComponent(Component component) {
		synchronized (component.getTreeLock()) {
			if (component == northwest) {
				northwest = null;
			}
			else if (component == north) {
				north = null;
			}
			else if (component == northeast) {
				northeast = null;
			}
			else if (component == west) {
				west = null;
			}
			else if (component == title) {
				title = null;
			}
			else if (component == titleLine) {
				titleLine = null;
			}
			else if (component == menu) {
				menu = null;
			}
			else if (component == content) {
				content = null;
			}
			else if (component == state) {
				state = null;
			}
			else if (component == east) {
				east = null;
			}
			else if (component == southwest) {
				southwest = null;
			}
			else if (component == south) {
				south = null;
			}
			else if (component == southeast) {
				southeast = null;
			}
		}
	}
	
	/**
	 * Returns the constraints for the specify component.
	 * @param component the component
	 * @return the constraints associated with the given component
	 */
	public Object getConstraints(Component component) {
		if (component == northwest) {
			return NORTHWEST;
		}
		else if (component == north) {
			return NORTH;
		}
		else if (component == northeast) {
			return NORTHEAST;
		}
		else if (component == west) {
			return WEST;
		}
		else if (component == title) {
			return TITLE;
		}
		else if (component == titleLine) {
			return TITLE_LINE;
		}
		else if (component == menu) {
			return MENU;
		}
		else if (component == content) {
			return CONTENT;
		}
		else if (component == state) {
			return STATE;
		}
		else if (component == east) {
			return EAST;
		}
		else if (component == southwest) {
			return SOUTHWEST;
		}
		else if (component == south) {
			return SOUTH;
		}
		else if (component == southeast) {
			return SOUTHEAST;
		}
		else {
			return null;
		}
	}
	
	/**
	 * Returns the representation of this layout.
	 * @return the string specifying this layout
	 */
	public String toString() {
		return getClass().getName() + "[vgap=" + vgap + "]";
	}

}