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Swing不丑系列:JComboBox

一直都是一只菜鳥..不管別人怎么說.

一直認為Swing不丑..所以打算這段時間寫個Swing不丑系列(獻丑了)

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引用請注明來源

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本文由陳思羽于 2011年8月24號出品..

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話說JComboBox 默認外觀確實不是太好看..在由于本人有時實在太賤.就是想要它好看...所以..這不..又折騰了..
其實這個ComboBox 剛開始想改變外觀只考慮到renderer 畢竟swing上所有的界面顯示全靠renderer來控制..
所以著手寫ComboBoxRenderer. 總是覺的 JComboBox 似乎不太好搞定因為它不但有顯示框還有小鍵頭.
還有彈出的List 還有ScrollBar..等等.. 似乎不那么好搞...不過Swing是強大的 ..只要你能想到..就可以做到.

那么我們要做幾件事.
1: 重載JComboBox 并且設置面板透明
2: 新建renderer 實現ListCellRenderer接口
3: 重載BasicComboBoxUI

1.重載JComboBox 并且設置面板透明設置renderer 以及設置 ui

public class IComboBox extends JComboBox{

public IComboBox(){

super();

init();

}

public IComboBox(ComboBoxModel model){

super(model);

init();

}

public IComboBox(Object[] items){

super(items);

init();

}

public IComboBox(Vector<?> items){

super(items);

init();

}

private void init(){

setOpaque(false);

setUI(new IComboBoxUI());

setRenderer(new IComboBoxRenderer());

setBackground(XUtil.defaultComboBoxColor);

}

public Dimension getPreferredSize(){

return super.getPreferredSize();

}

2.新建renderer 實現ListCellRenderer接口.注意.這里的ComboBoxRenderer它是控制combobox彈出的List 并非控制JComboBox的注意他實現的是ListCellRenderer

public class IComboBoxRenderer implements ListCellRenderer {

private DefaultListCellRenderer defaultCellRenderer = new DefaultListCellRenderer();

public IComboBoxRenderer() {

super();

}

public Component getListCellRendererComponent(JList list, Object value,

int index, boolean isSelected, boolean cellHasFocus) {

JLabel renderer = (JLabel)defaultCellRenderer.getListCellRendererComponent(

list, value, index, isSelected, cellHasFocus);

if(isSelected){

renderer.setBackground(XUtil.defaultComboBoxBoundsColor);

renderer.setForeground(Color.WHITE);

}else{

renderer.setBackground(Color.WHITE);

}

list.setSelectionBackground(XUtil.defaultComboBoxColor);

list.setBorder(null);

renderer.setFont(XUtil.defaultComboBoxFont);

renderer.setHorizontalAlignment(JLabel.CENTER);

return renderer;

}

3重載BasicComboBoxUI .sure 這里當然要注意.因為他是JComboBox的繪制機制
這里包括ComboBox右邊的那個箭頭的Button.(我們已經通過重寫 createArrowButton 來改變這個Button);
至于彈出的List ,it in here, look it ..createPoput(); it create ComboPopup.(不好意思最近在學英文總是那么順口來那么幾句.)
這里存在一個ScrollPane 它包含了List.并且我們重寫ScrollPane的paintBorder方法來讓我們畫出List的Border

public class IComboBoxUI extends BasicComboBoxUI {

private JButton arrow;

private boolean boundsLight = false;

private static final int ARCWIDTH = 15;

private static final int ARCHEIGHT = 15;

public IComboBoxUI() {

super();

}

protected JButton createArrowButton() {

arrow = new JButton();

arrow.setIcon(XUtil.defaultComboBoxArrowIcon);

arrow.setRolloverEnabled(true);

arrow.setRolloverIcon(XUtil.defaultComboBoxArrowIcon_Into);

arrow.setBorder(null);

arrow.setBackground(XUtil.defaultComboBoxColor);

arrow.setOpaque(false);

arrow.setContentAreaFilled(false);

return arrow;

}

public void paint(Graphics g, JComponent c) {

hasFocus = comboBox.hasFocus();

Graphics2D g2 = (Graphics2D)g;

if (!comboBox.isEditable()) {

Rectangle r = rectangleForCurrentValue();

//重點:JComboBox的textfield 的繪制并不是靠Renderer來控制這點讓我很吃驚.

//它會通過paintCurrentValueBackground來繪制背景

//然后通過paintCurrentValue();去繪制JComboBox里顯示的值

paintCurrentValueBackground(g2, r, hasFocus);

paintCurrentValue(g2, r, hasFocus);

}

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

int width = (int) this.getPreferredSize(c).getWidth()

+ arrow.getWidth() - 2;

int height = 0;

int heightOffset = 0;

if (comboBox.isPopupVisible()) {

heightOffset = 5;

height = (int) this.getPreferredSize(c).getHeight();

arrow.setIcon(XUtil.defaultComboBoxArrowIcon_Into);

} else {

heightOffset = 0;

height = (int) this.getPreferredSize(c).getHeight() - 1;

arrow.setIcon(XUtil.defaultComboBoxArrowIcon);

}

if (comboBox.isFocusable()) {

g2.setColor(new Color(150, 207, 254));

}

g2.drawRoundRect(0, 0, width, height + heightOffset,ARCWIDTH,ARCHEIGHT);

}

public void paintCurrentValue(Graphics g, Rectangle bounds, boolean hasFocus) {

Font oldFont = comboBox.getFont();

comboBox.setFont(XUtil.defaultComboBoxFont);

super.paintCurrentValue(g, bounds, hasFocus);

comboBox.setFont(oldFont);

}

public Dimension getPreferredSize(JComponent c) {

return super.getPreferredSize(c);

}

public boolean isBoundsLight() {

return boundsLight;

}

public void setBoundsLight(boolean boundsLight) {

this.boundsLight = boundsLight;

}

protected ComboPopup createPopup() {

ComboPopup popup = new BasicComboPopup(comboBox) {

protected JScrollPane createScroller() {

IScrollPane sp = new IScrollPane(list,

ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,

ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

sp.setHorizontalScrollBar(null);

return sp;

}

//重載paintBorder方法來畫出我們想要的邊框..

public void paintBorder(Graphics g){

Graphics2D g2 = (Graphics2D) g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

g2.setColor(new Color(150, 207, 254));

g2.drawRoundRect(0,-arrow.getHeight(),getWidth()-1,getHeight()+arrow.getHeight()-1,0,0);

}

};

return popup;

}

ok. 那么到這里 ComboBox這塊已經end 但是似乎還有個問題存在那就是createPopup 方法里的ScrollPane的滾動條還是有點丑.
so。.next 我們搞定 it.

1:繼承 ScrollBar 并且 setUI();
2:繼承 BasicScrollBarUI 我們來G出我們的效果.
paintThumb 繪制scrollbar里拖動的小box 我們先畫個邊框 and draw two Orange line.
paintTrack 繪制scrollbar里小box的軌跡.也就是那個啥(術語怎么說來著?拖拽滑塊?).
注意:我們首先將Graphics設置透明后在去畫面板然后立刻把Graphics設置為不透明..
這樣是為了能讓我們把軌跡左邊邊界畫出來...
createIncreaseButton draw down arrowButton 小心千萬不要use JButton button = new JButton();
should use BasicArrowButton 不然你將無法click this button 并產生你想要的效果..
你猜的到 createDecreaseButton(); 方法是干什么的..(笨蛋上面那個Button啦);

public class IScrollBarUI extends BasicScrollBarUI{

public IScrollBarUI(){

super();

}

protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) {

int width = thumbBounds.width;

int height = thumbBounds.height;

Graphics2D g2 = (Graphics2D)g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

g2.translate(thumbBounds.x, thumbBounds.y);

g2.setColor(XUtil.defaultComboBoxBoundsColor);

g2.drawRoundRect(1,1,width-2, height-2,5,5);

g2.setColor(Color.ORANGE);

g2.drawLine(3,height/2,width-4,height/2);

g2.drawLine(3,height/2+3,width-4,height/2+3);

g2.translate(-thumbBounds.x, -thumbBounds.y);

}

protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds) {

g.setColor(XUtil.defaultComboBoxColor);

int x = trackBounds.x;

int y = trackBounds.y;

int width = trackBounds.width;

int height = trackBounds.height;

Graphics2D g2 = (Graphics2D)g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

g2.setComposite(AlphaComposite

.getInstance(AlphaComposite.SRC_OVER, 0.1f));

g2.fill3DRect(x, y, width, height, true);

g2.setComposite(AlphaComposite

.getInstance(AlphaComposite.SRC_OVER, 1f));

g2.setColor(XUtil.defaultComboBoxBoundsColor.brighter());

g2.fill3DRect(x, y, 1, height+1, true);

if(trackHighlight == DECREASE_HIGHLIGHT) {

paintDecreaseHighlight(g);

}

else if(trackHighlight == INCREASE_HIGHLIGHT) {

paintIncreaseHighlight(g);

}

protected JButton createIncreaseButton(int orientation) {

JButton button = new BasicArrowButton(orientation){

public void paint(Graphics g) {

Graphics2D g2 = (Graphics2D)g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

g2.setColor(XUtil.defaultComboBoxBoundsColor);

g2.drawLine(0,0,0,getHeight());

g2.drawLine(0,0,getWidth(),0-1);

g2.drawImage(((ImageIcon)XUtil.defaultComboBoxArrowIcon_Into).getImage(),-1,0,null);

}

};

button.setOpaque(false);

return button;

}

protected JButton createDecreaseButton(int orientation) {

JButton button = new BasicArrowButton(orientation){

public void paint(Graphics g) {

Graphics2D g2 = (Graphics2D)g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

g2.setColor(XUtil.defaultComboBoxBoundsColor);

g2.drawLine(0,0,0,getHeight());

g2.drawLine(0,getHeight()-1,getWidth(),getHeight());

g2.drawImage(((ImageIcon)XUtil.defaultComboBoxArrowIcon_Into).getImage(),-1,0,null);

}

};

button.setOpaque(false);

return button;

}

posted on 2011-03-23 16:58 相信閱讀(7559) 評論(12) 編輯收藏所屬分類: Swing文章


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# re: Swing不丑系列:JComboBox 2011-03-23 20:53 greatghoul

# re: Swing不丑系列:JComboBox 2011-03-23 20:57 相信

# re: Swing不丑系列:JComboBox 2011-03-24 17:10 鄭州SEO

# re: Swing不丑系列:JComboBox 2011-03-24 17:11 相信

# re: Swing不丑系列:JComboBox[未登錄] 2011-03-24 23:09 Charlie

# re: Swing不丑系列:JComboBox 2011-03-27 13:09 penngo

# re: Swing不丑系列:JComboBox[未登錄] 2011-08-11 09:46 haha

# re: Swing不丑系列:JComboBox 2012-08-15 13:06 hxy

# re: Swing不丑系列:JComboBox[未登錄] 2012-11-27 21:06 文斌

# re: Swing不丑系列:JComboBox 2013-11-03 21:13 路過

# re: Swing不丑系列:JComboBox 2014-07-17 15:07 coverfate

# re: Swing不丑系列:JComboBox 2014-07-17 15:25 相信

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