JAVA drawImage

来源：百度知道 编辑：UC知道 时间：2024/06/14 13:59:08
drawImage
public abstract boolean drawImage(Image img,
int x,
int y,
ImageObserver observer)
第四个参数ImageObserver observer意思是当转换了更多图像时要通知的对象。 具体什么意思不太懂 谁能详细的解释下这个参数，还有这个参数取值都有什么？ 谢谢

java.awt.image
接口 ImageObserver
所有已知实现类：
AbstractButton, AbstractColorChooserPanel, Applet, BasicArrowButton, BasicComboBoxRenderer, BasicComboBoxRenderer.UIResource, BasicComboPopup, BasicInternalFrameTitlePane, BasicInternalFrameTitlePane.SystemMenuBar, BasicSplitPaneDivider, BasicToolBarUI.DragWindow, Box, Box.Filler, Button, Canvas, CellRendererPane, Checkbox, Choice, Component, Container, DefaultListCellRenderer, DefaultListCellRenderer.UIResource, DefaultTableCellRenderer, DefaultTableCellRenderer.UIResource, DefaultTreeCellEditor.DefaultTextField, DefaultTreeCellEditor.EditorContainer, DefaultTreeCellRenderer, Dialog, FileDialog, Frame, JApplet, JButton, JCheckBox, JCheckBoxMenuItem, JColorChooser, JComboBox, JComponent, JDesktopPane, JDialog, JEditorPane, JFileChooser, JFormattedTextField, JFrame, JInternalFrame, JInternalFrame.JDesktopIcon, JLabel, JLayeredPane, JList, JMenu, JMenuBar, JMenuItem, JOptionPane, JPanel, JPasswordField, JPopupMenu, JPopupMenu.S