[英]How to add to this round button metal background in java?
How to give this button background to be as jbutton 如何将此按钮背景设为jbutton
i want to give this button metal color or grediant color how to make that? 我想给这个按钮加上金属色或渐变色怎么做?
import java.awt.*;
import java.awt.event.*;
RoundButton - a class that produces a lightweight button. RoundButton-产生轻量级按钮的类。
Lightweight components can have "transparent" areas, meaning that you can see the background of the container behind these areas. 轻量级组件可以具有“透明”区域,这意味着您可以在这些区域后面看到容器的背景。
@SuppressWarnings("serial")
public class RoundButton extends Component {
ActionListener actionListener; // Post action events to listeners
String label; // The Button's text
protected boolean pressed = false; // true if the button is detented.
/**
* Constructs a RoundButton with no label.
*/
public RoundButton() {
this("");
}
/**
* Constructs a RoundButton with the specified label.
* @param label the label of the button
*/
public RoundButton(String label) {
this.label = label;
enableEvents(AWTEvent.MOUSE_EVENT_MASK);
}
/**
* gets the label
* @see setLabel
*/
public String getLabel() {
return label;
}
/**
* sets the label
* @see getLabel
*/
public void setLabel(String label) {
this.label = label;
invalidate();
repaint();
}
/**
* paints the RoundButton
*/
public void paint(Graphics g) {
int s = Math.min(getSize().width - 1, getSize().height - 1);
// paint the interior of the button
if(pressed) {
g.setColor(getBackground().darker().darker());
} else {
g.setColor(getBackground());
}
g.fillArc(0, 0, s, s, 0, 360);
// draw the perimeter of the button
g.setColor(getBackground().darker().darker().darker());
g.drawArc(0, 0, s, s, 0, 360);
// draw the label centered in the button
Font f = getFont();
if(f != null) {
FontMetrics fm = getFontMetrics(getFont());
g.setColor(getForeground());
g.drawString(label,
s/2 - fm.stringWidth(label)/2,
s/2 + fm.getMaxDescent());
}
}
/**
* The preferred size of the button.
*/
public Dimension getPreferredSize() {
Font f = getFont();
if(f != null) {
FontMetrics fm = getFontMetrics(getFont());
int max = Math.max(fm.stringWidth(label) + 40, fm.getHeight() + 40);
return new Dimension(max, max);
} else {
return new Dimension(100, 100);
}
}
/**
* The minimum size of the button.
*/
public Dimension getMinimumSize() {
return new Dimension(100, 100);
}
/**
* Adds the specified action listener to receive action events
* from this button.
* @param listener the action listener
*/
public void addActionListener(ActionListener listener) {
actionListener = AWTEventMulticaster.add(actionListener, listener);
enableEvents(AWTEvent.MOUSE_EVENT_MASK);
}
/**
* Removes the specified action listener so it no longer receives
* action events from this button.
* @param listener the action listener
*/
public void removeActionListener(ActionListener listener) {
actionListener = AWTEventMulticaster.remove(actionListener, listener);
}
/**
* Determine if click was inside round button.
*/
public boolean contains(int x, int y) {
int mx = getSize().width/2;
int my = getSize().height/2;
return (((mx-x)*(mx-x) + (my-y)*(my-y)) <= mx*mx);
}
/**
* Paints the button and distribute an action event to all listeners.
*/
public void processMouseEvent(MouseEvent e) {
@SuppressWarnings("unused")
Graphics g;
switch(e.getID()) {
case MouseEvent.MOUSE_PRESSED:
// render myself inverted....
pressed = true;
// Repaint might flicker a bit. To avoid this, you can use
// double buffering (see the Gauge example).
repaint();
break;
case MouseEvent.MOUSE_RELEASED:
if(actionListener != null) {
actionListener.actionPerformed(new ActionEvent(
this, ActionEvent.ACTION_PERFORMED, label));
}
// render myself normal again
if(pressed == true) {
pressed = false;
// Repaint might flicker a bit. To avoid this, you can use
// double buffering (see the Gauge example).
repaint();
}
break;
case MouseEvent.MOUSE_ENTERED:
break;
case MouseEvent.MOUSE_EXITED:
if(pressed == true) {
// Cancel! Don't send action event.
pressed = false;
// Repaint might flicker a bit. To avoid this, you can use
// double buffering (see the Gauge example).
repaint();
// Note: for a more complete button implementation,
// you wouldn't want to cancel at this point, but
// rather detect when the mouse re-entered, and
// re-highlight the button. There are a few state
// issues that that you need to handle, which we leave
// this an an excercise for the reader (I always
// wanted to say that!)
}
break;
}
super.processMouseEvent(e);
}
}
java.awt.Component
does not support opacity/transparency, only Swing components do. java.awt.Component
不支持不透明度/透明度,只有Swing组件支持。
You should take the time to read through 你应该花点时间通读
You have a number issues to start with... 首先要解决的问题是...
processMouseEvent
, you should use a MouseListener
instead processMouseEvent
,应改用MouseListener
contains
method should take into consideration the "shape" of the button contains
方法应考虑按钮的“形状” paintComponent
over paint
when painting lightweight components paintComponent
不是paint
super.paintXxx
from any paint method you override, there is only a very small number of times when you wouldn't, and then you become responsible for taking over there work super.paintXxx
,只有极少数的情况您会不这样做,然后您才有责任接管那里的工作 setOpaque(false)
setOpaque(false)
将组件标记为透明 Unpressed/Pressed 未按/压
public class TestRoundButton {
public static void main(String[] args) {
new TestRoundButton();
}
public TestRoundButton() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setBackground(Color.RED);
frame.setLayout(new GridBagLayout());
frame.add(new RoundButton(":)"));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class RoundButton extends JPanel {
ActionListener actionListener; // Post action events to listeners
String label; // The Button's text
protected boolean pressed = false; // true if the button is detented.
private MouseListener listener;
/**
* Constructs a RoundButton with no label.
*/
public RoundButton() {
this("");
}
@Override
public void addNotify() {
super.addNotify();
if (listener == null) {
listener = new MouseHandler();
addMouseListener(listener);
}
}
@Override
public void removeNotify() {
removeMouseListener(listener);
super.removeNotify();
}
/**
* Constructs a RoundButton with the specified label.
*
* @param label the label of the button
*/
public RoundButton(String label) {
this.label = label;
//...
setOpaque(false);
// Use a mouse listener instead
// enableEvents(AWTEvent.MOUSE_EVENT_MASK);
}
/**
* gets the label
*
* @see setLabel
*/
public String getLabel() {
return label;
}
/**
* sets the label
*
* @see getLabel
*/
public void setLabel(String label) {
this.label = label;
invalidate();
repaint();
}
/**
* paints the RoundButton
*/
// Prefer paintComponent over paint...
@Override
protected void paintComponent(Graphics g) {
// YOU MUST CALL super.paintXxx THERE IS NO EXCUSE NOT TO, EVER!!
super.paintComponent(g);
int s = Math.min(getSize().width - 1, getSize().height - 1);
Graphics2D g2d = (Graphics2D) g.create();
// paint the interior of the button
g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
Color highlight = getBackground();
if (pressed) {
highlight = highlight.darker();
}
Color darklight = highlight.darker();
LinearGradientPaint lgp = new LinearGradientPaint(
new Point(0, 0),
new Point(0, s),
new float[]{0, 1f},
new Color[]{highlight, darklight});
Ellipse2D shape = new Ellipse2D.Float(0, 0, s, s);
g2d.setPaint(lgp);
g2d.fill(shape);
// draw the perimeter of the button
g2d.setColor(getBackground().darker().darker().darker());
g2d.draw(shape);
// draw the label centered in the button
Font f = getFont();
if (f != null) {
FontMetrics fm = getFontMetrics(getFont());
g2d.setColor(getForeground());
g2d.drawString(label,
s / 2 - fm.stringWidth(label) / 2,
s / 2 + fm.getMaxDescent());
}
g2d.dispose();
}
/**
* The preferred size of the button.
*/
public Dimension getPreferredSize() {
Font f = getFont();
if (f != null) {
FontMetrics fm = getFontMetrics(getFont());
int max = Math.max(fm.stringWidth(label) + 40, fm.getHeight() + 40);
return new Dimension(max, max);
} else {
return new Dimension(100, 100);
}
}
/**
* The minimum size of the button.
*/
public Dimension getMinimumSize() {
return new Dimension(100, 100);
}
/**
* Adds the specified action listener to receive action events from this
* button.
*
* @param listener the action listener
*/
public void addActionListener(ActionListener listener) {
// actionListener = AWTEventMulticaster.add(actionListener, listener);
// enableEvents(AWTEvent.MOUSE_EVENT_MASK);
listenerList.add(ActionListener.class, listener);
}
/**
* Removes the specified action listener so it no longer receives action
* events from this button.
*
* @param listener the action listener
*/
public void removeActionListener(ActionListener listener) {
// actionListener = AWTEventMulticaster.remove(actionListener, listener);
listenerList.add(ActionListener.class, listener);
}
/**
* Determine if click was inside round button.
*/
public boolean contains(int x, int y) {
// This needs to work more on the actual painted shape...
int mx = getSize().width / 2;
int my = getSize().height / 2;
return (((mx - x) * (mx - x) + (my - y) * (my - y)) <= mx * mx);
}
/**
* Paints the button and distribute an action event to all listeners.
*/
// public void processMouseEvent(MouseEvent e) {
// @SuppressWarnings("unused")
// Graphics g;
// switch (e.getID()) {
// case MouseEvent.MOUSE_PRESSED:
// // render myself inverted....
// pressed = true;
//
// // Repaint might flicker a bit. To avoid this, you can use
// // double buffering (see the Gauge example).
// repaint();
// break;
// case MouseEvent.MOUSE_RELEASED:
// if (actionListener != null) {
// actionListener.actionPerformed(new ActionEvent(
// this, ActionEvent.ACTION_PERFORMED, label));
// }
// // render myself normal again
// if (pressed == true) {
// pressed = false;
//
// // Repaint might flicker a bit. To avoid this, you can use
// // double buffering (see the Gauge example).
// repaint();
// }
// break;
// case MouseEvent.MOUSE_ENTERED:
//
// break;
// case MouseEvent.MOUSE_EXITED:
// if (pressed == true) {
// // Cancel! Don't send action event.
// pressed = false;
//
// // Repaint might flicker a bit. To avoid this, you can use
// // double buffering (see the Gauge example).
// repaint();
//
// // Note: for a more complete button implementation,
// // you wouldn't want to cancel at this point, but
// // rather detect when the mouse re-entered, and
// // re-highlight the button. There are a few state
// // issues that that you need to handle, which we leave
// // this an an excercise for the reader (I always
// // wanted to say that!)
// }
// break;
// }
// super.processMouseEvent(e);
// }
public class MouseHandler extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
pressed = true;
repaint();
}
@Override
public void mouseReleased(MouseEvent e) {
pressed = false;
repaint();
}
}
}
}
Now, having done all that, you might like to take a serious look at javax.swing.AbstractButton as you base component 现在,完成所有这些操作之后,您可能想在作为基础组件时认真看一下javax.swing.AbstractButton。
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