basicdesktoppaneui.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

                }
                moving = (key == MOVE) ? true : false;
                resizing = (key == RESIZE) ? true : false;

                focusOwner = KeyboardFocusManager.
                    getCurrentKeyboardFocusManager().getFocusOwner();
                if (!SwingUtilities.isDescendingFrom(focusOwner, sourceFrame)) {
                    focusOwner = null;
                }
                sourceFrame.requestFocus();
            }
            else if (LEFT == key ||
                     RIGHT == key ||
                     UP == key ||
                     DOWN == key ||
                     SHRINK_RIGHT == key ||
                     SHRINK_LEFT == key ||
                     SHRINK_UP == key ||
                     SHRINK_DOWN == key) {
                JInternalFrame c = dp.getSelectedFrame();
                if (sourceFrame == null || c != sourceFrame ||
                        KeyboardFocusManager.
                            getCurrentKeyboardFocusManager().getFocusOwner() !=
                                sourceFrame) {
                    return;
                }
                Insets minOnScreenInsets =
                    UIManager.getInsets("Desktop.minOnScreenInsets");
                Dimension size = c.getSize();
                Dimension minSize = c.getMinimumSize();
                int dpWidth = dp.getWidth();
                int dpHeight = dp.getHeight();
                int delta;
                Point loc = c.getLocation();
                if (LEFT == key) {
                    if (moving) {
                        c.setLocation(
                                loc.x + size.width - MOVE_RESIZE_INCREMENT <
                                    minOnScreenInsets.right ?
                                        -size.width + minOnScreenInsets.right :
                                        loc.x - MOVE_RESIZE_INCREMENT,
                                loc.y);
                    } else if (resizing) {
                        c.setLocation(loc.x - MOVE_RESIZE_INCREMENT, loc.y);
                        c.setSize(size.width + MOVE_RESIZE_INCREMENT,
                                size.height);
                    }
                } else if (RIGHT == key) {
                    if (moving) {
                        c.setLocation(
                                loc.x + MOVE_RESIZE_INCREMENT >
                                    dpWidth - minOnScreenInsets.left ?
                                        dpWidth - minOnScreenInsets.left :
                                        loc.x + MOVE_RESIZE_INCREMENT,
                                loc.y);
                    } else if (resizing) {
                        c.setSize(size.width + MOVE_RESIZE_INCREMENT,
                                size.height);
                    }
                } else if (UP == key) {
                    if (moving) {
                        c.setLocation(loc.x,
                                loc.y + size.height - MOVE_RESIZE_INCREMENT <
                                    minOnScreenInsets.bottom ?
                                        -size.height +
                                            minOnScreenInsets.bottom :
                                        loc.y - MOVE_RESIZE_INCREMENT);
                    } else if (resizing) {
                        c.setLocation(loc.x, loc.y - MOVE_RESIZE_INCREMENT);
                        c.setSize(size.width,
                                size.height + MOVE_RESIZE_INCREMENT);
                    }
                } else if (DOWN == key) {
                    if (moving) {
                        c.setLocation(loc.x,
                                loc.y + MOVE_RESIZE_INCREMENT >
                                    dpHeight - minOnScreenInsets.top ?
                                        dpHeight - minOnScreenInsets.top :
                                        loc.y + MOVE_RESIZE_INCREMENT);
                    } else if (resizing) {
                        c.setSize(size.width,
                                size.height + MOVE_RESIZE_INCREMENT);
                    }
                } else if (SHRINK_LEFT == key && resizing) {
                    // Make sure we don't resize less than minimum size.
                    if (minSize.width < (size.width - MOVE_RESIZE_INCREMENT)) {
                        delta = MOVE_RESIZE_INCREMENT;
                    } else {
                        delta = size.width - minSize.width;
                    }

                    // Ensure that we keep the internal frame on the desktop.
                    if (loc.x + size.width - delta < minOnScreenInsets.left) {
                        delta = loc.x + size.width - minOnScreenInsets.left;
                    }
                    c.setSize(size.width - delta, size.height);
                } else if (SHRINK_RIGHT == key && resizing) {
                    // Make sure we don't resize less than minimum size.
                    if (minSize.width < (size.width - MOVE_RESIZE_INCREMENT)) {
                        delta = MOVE_RESIZE_INCREMENT;
                    } else {
                        delta = size.width - minSize.width;
                    }

                    // Ensure that we keep the internal frame on the desktop.
                    if (loc.x + delta > dpWidth - minOnScreenInsets.right) {
                        delta = (dpWidth - minOnScreenInsets.right) - loc.x;
                    }

                    c.setLocation(loc.x + delta, loc.y);
                    c.setSize(size.width - delta, size.height);
                } else if (SHRINK_UP == key && resizing) {
                    // Make sure we don't resize less than minimum size.
                    if (minSize.height <
                            (size.height - MOVE_RESIZE_INCREMENT)) {
                        delta = MOVE_RESIZE_INCREMENT;
                    } else {
                        delta = size.height - minSize.height;
                    }

                    // Ensure that we keep the internal frame on the desktop.
                    if (loc.y + size.height - delta <
                            minOnScreenInsets.bottom) {
                        delta = loc.y + size.height - minOnScreenInsets.bottom;
                    }

                    c.setSize(size.width, size.height - delta);
                } else if (SHRINK_DOWN == key  && resizing) {
                    // Make sure we don't resize less than minimum size.
                    if (minSize.height <
                            (size.height - MOVE_RESIZE_INCREMENT)) {
                        delta = MOVE_RESIZE_INCREMENT;
                    } else {
                        delta = size.height - minSize.height;
                    }

                    // Ensure that we keep the internal frame on the desktop.
                    if (loc.y + delta > dpHeight - minOnScreenInsets.top) {
                        delta = (dpHeight - minOnScreenInsets.top) - loc.y;
                    }

                    c.setLocation(loc.x, loc.y + delta);
                    c.setSize(size.width, size.height - delta);
                }
            }
            else if (NEXT_FRAME == key || PREVIOUS_FRAME == key) {
                dp.selectFrame((key == NEXT_FRAME) ? true : false);
            }
            else if (NAVIGATE_NEXT == key ||
                     NAVIGATE_PREVIOUS == key) {
                boolean moveForward = true;
                if (NAVIGATE_PREVIOUS == key) {
                    moveForward = false;
                }
                Container cycleRoot = dp.getFocusCycleRootAncestor();

                if (cycleRoot != null) {
                    FocusTraversalPolicy policy =
                        cycleRoot.getFocusTraversalPolicy();
                    if (policy != null && policy instanceof
                            SortingFocusTraversalPolicy) {
                        SortingFocusTraversalPolicy sPolicy =
                            (SortingFocusTraversalPolicy)policy;
                        boolean idc = sPolicy.getImplicitDownCycleTraversal();
                        try {
                            sPolicy.setImplicitDownCycleTraversal(false);
                            if (moveForward) {
                                KeyboardFocusManager.
                                    getCurrentKeyboardFocusManager().
                                        focusNextComponent(dp);
                            } else {
                                KeyboardFocusManager.
                                    getCurrentKeyboardFocusManager().
                                    focusPreviousComponent(dp);
                            }
                        } finally {
                            sPolicy.setImplicitDownCycleTraversal(idc);
                        }
                    }
                }
            }
        }

        private void setState(JDesktopPane dp, String state) {
            if (state == CLOSE) {
                JInternalFrame f = dp.getSelectedFrame();
                if (f == null) {
                    return;
                }
                f.doDefaultCloseAction();
            } else if (state == MAXIMIZE) {
                // maximize the selected frame
                JInternalFrame f = dp.getSelectedFrame();
                if (f == null) {
                    return;
                }
                if (!f.isMaximum()) {
                    if (f.isIcon()) {
                        try {
                            f.setIcon(false);
                            f.setMaximum(true);
                        } catch (PropertyVetoException pve) {}
                    } else {
                        try {
                            f.setMaximum(true);
                        } catch (PropertyVetoException pve) {
                        }
                    }
                }
            } else if (state == MINIMIZE) {
                // minimize the selected frame
                JInternalFrame f = dp.getSelectedFrame();
                if (f == null) {
                    return;
                }
                if (!f.isIcon()) {
                    try {
                        f.setIcon(true);
                    } catch (PropertyVetoException pve) {
                    }
                }
            } else if (state == RESTORE) {
                // restore the selected minimized or maximized frame
                JInternalFrame f = dp.getSelectedFrame();
                if (f == null) {
                    return;
                }
                try {
                    if (f.isIcon()) {
                        f.setIcon(false);
                    } else if (f.isMaximum()) {
                        f.setMaximum(false);
                    }
                    f.setSelected(true);
                } catch (PropertyVetoException pve) {
                }
            }
        }

        public boolean isEnabled(Object sender) {
            if (sender instanceof JDesktopPane) {
                JDesktopPane dp = (JDesktopPane)sender;
                String action = getName();
                if (action == Actions.NEXT_FRAME ||
                    action == Actions.PREVIOUS_FRAME) {
                    return true;
                }
                JInternalFrame iFrame = dp.getSelectedFrame();
                if (iFrame == null) {
                    return false;
                } else if (action == Actions.CLOSE) {
                    return iFrame.isClosable();
                } else if (action == Actions.MINIMIZE) {
                    return iFrame.isIconifiable();
                } else if (action == Actions.MAXIMIZE) {
                    return iFrame.isMaximizable();
                }
                return true;
            }
            return false;
        }
    }


    /**
     * Handles restoring a minimized or maximized internal frame.
     * @since 1.3
     */
    protected class OpenAction extends AbstractAction {
	public void actionPerformed(ActionEvent evt) {
            JDesktopPane dp = (JDesktopPane)evt.getSource();
            SHARED_ACTION.setState(dp, Actions.RESTORE);
	}

	public boolean isEnabled() { 
	    return true;
	}
    }

    /**
     * Handles closing an internal frame.
     */
    protected class CloseAction extends AbstractAction {
	public void actionPerformed(ActionEvent evt) {
            JDesktopPane dp = (JDesktopPane)evt.getSource();
            SHARED_ACTION.setState(dp, Actions.CLOSE);
	}

	public boolean isEnabled() { 
            JInternalFrame iFrame = desktop.getSelectedFrame();
            if (iFrame != null) {
                return iFrame.isClosable();
            }
            return false;
	}
    }

    /**
     * Handles minimizing an internal frame.
     */
    protected class MinimizeAction extends AbstractAction {
	public void actionPerformed(ActionEvent evt) {
            JDesktopPane dp = (JDesktopPane)evt.getSource();
            SHARED_ACTION.setState(dp, Actions.MINIMIZE);
	}

	public boolean isEnabled() { 
            JInternalFrame iFrame = desktop.getSelectedFrame();
            if (iFrame != null) {
	        return iFrame.isIconifiable();
            }
            return false;
	}
    }

    /**
     * Handles maximizing an internal frame.
     */
    protected class MaximizeAction extends AbstractAction {
	public void actionPerformed(ActionEvent evt) {
            JDesktopPane dp = (JDesktopPane)evt.getSource();
            SHARED_ACTION.setState(dp, Actions.MAXIMIZE);
	}

	public boolean isEnabled() { 
            JInternalFrame iFrame = desktop.getSelectedFrame();
            if (iFrame != null) {
	        return iFrame.isMaximizable();
            }
            return false;
        }
    }

    /**
     * Handles navigating to the next internal frame. 
     */
    protected class NavigateAction extends AbstractAction {
	public void actionPerformed(ActionEvent evt) {
            JDesktopPane dp = (JDesktopPane)evt.getSource();
            dp.selectFrame(true);
	}

	public boolean isEnabled() { 
	    return true;
	}
    }
}