package amarsoft.rcp.base.widgets;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.accessibility.*;
/** *//**
* 该类是对{@link org.eclipse.swt.custom.CLabel CLabel}的改写，使之能够显示动画GIF。
* 由于各种浏览器对于Gif图片的中每一帧的驻留时间的解析不尽相同，所以用本类实现的Gif动画展示有可能和在非IE核心的浏览器中看到的不一致。
*
* @author ggfan@amarsoft
*
*/
public class GifCLabel extends Canvas 
{
/** *//** 图片和文本之间的间隔 */
private static final int GAP = 5;
/** *//** 默认空白距离，以像素为单位 */
private static final int DEFAULT_MARGIN = 3;
/** *//** 当文本太长显示不全时，截断文本并在后面追加显示一个省略号，在某些操作系统上有一个符号专门用于此目的——\u2026 */
private static final String ELLIPSIS = "";
/** *//** 对齐方式，默认左对齐 */
private int align = SWT.LEFT;
/** *//** 左边空白 */
private int leftMargin = DEFAULT_MARGIN;
/** *//** 顶部空白 */
private int topMargin = DEFAULT_MARGIN;
/** *//** 右边空白 */
private int rightMargin = DEFAULT_MARGIN;
/** *//** 底部空白 */
private int bottomMargin = DEFAULT_MARGIN;
/** *//** 当前文本 */
private String text;
/** *//** 当前图片 */
private Image image;
/** *//** 提示信息，鼠标悬停时弹出 */
private String appToolTipText;
/** *//** 是否忽略销毁方法调用 */
private boolean ignoreDispose;
/** *//** 背景图片 */
private Image backgroundImage;
/** *//** 渐变颜色 */
private Color[] gradientColors;
/** *//** 渐变百分比 */
private int[] gradientPercents;
/** *//** 是否在垂直方向渐变 */
private boolean gradientVertical;
/** *//** 背景色 */
private Color background;
/** *//**
* 线程，用于切换图片帧
*/
private GifThread thread = null;
private static int DRAW_FLAGS = SWT.DRAW_MNEMONIC | SWT.DRAW_TAB
| SWT.DRAW_TRANSPARENT | SWT.DRAW_DELIMITER;
/** *//**
* 构造函数
* @param parent
* @param style
*/
public GifCLabel(Composite parent, int style) {
super(parent, checkStyle(style));
if ((style & (SWT.CENTER | SWT.RIGHT)) == 0)
style |= SWT.LEFT;
if ((style & SWT.CENTER) != 0)
align = SWT.CENTER;
if ((style & SWT.RIGHT) != 0)
align = SWT.RIGHT;
if ((style & SWT.LEFT) != 0)
align = SWT.LEFT;
addPaintListener(new PaintListener() {
public void paintControl(PaintEvent event) {
onPaint(event);
}
});
addTraverseListener(new TraverseListener() {
public void keyTraversed(TraverseEvent event) {
if (event.detail == SWT.TRAVERSE_MNEMONIC) {
onMnemonic(event);
}
}
});
addListener(SWT.Dispose, new Listener() {
public void handleEvent(Event event) {
onDispose(event);
}
});
initAccessible();
}
/** *//**
*检查Style参数，去掉无效参数
*/
private static int checkStyle(int style) {
if ((style & SWT.BORDER) != 0)
style |= SWT.SHADOW_IN;
int mask = SWT.SHADOW_IN | SWT.SHADOW_OUT | SWT.SHADOW_NONE
| SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT;
style = style & mask;
return style |= SWT.NO_FOCUS | SWT.DOUBLE_BUFFERED;
}
public Point computeSize(int wHint, int hHint, boolean changed) {
checkWidget();
Point e = getTotalSize(image, text);
if (wHint == SWT.DEFAULT) {
e.x += leftMargin + rightMargin;
} else {
e.x = wHint;
}
if (hHint == SWT.DEFAULT) {
e.y += topMargin + bottomMargin;
} else {
e.y = hHint;
}
return e;
}
private void drawBevelRect(GC gc, int x, int y, int w, int h,
Color topleft, Color bottomright) {
gc.setForeground(bottomright);
gc.drawLine(x + w, y, x + w, y + h);
gc.drawLine(x, y + h, x + w, y + h);
gc.setForeground(topleft);
gc.drawLine(x, y, x + w - 1, y);
gc.drawLine(x, y, x, y + h - 1);
}
char _findMnemonic(String string) {
if (string == null)
return '\0';
int index = 0;
int length = string.length();
do {
while (index < length && string.charAt(index) != '&')
index++;
if (++index >= length)
return '\0';
if (string.charAt(index) != '&')
return Character.toLowerCase(string.charAt(index));
index++;
} while (index < length);
return '\0';
}
public int getAlignment() {
return align;
}
public int getBottomMargin() {
return bottomMargin;
}
public Image getImage() {
return image;
}
public int getLeftMargin() {
return leftMargin;
}
public int getRightMargin() {
return rightMargin;
}
private Point getTotalSize(Image image, String text) {
Point size = new Point(0, 0);
if (image != null) {
Rectangle r = image.getBounds();
size.x += r.width;
size.y += r.height;
}
GC gc = new GC(this);
if (text != null && text.length() > 0) {
Point e = gc.textExtent(text, DRAW_FLAGS);
size.x += e.x;
size.y = Math.max(size.y, e.y);
if (image != null)
size.x += GAP;
} else {
size.y = Math.max(size.y, gc.getFontMetrics().getHeight());
}
gc.dispose();
return size;
}
public int getStyle() {
int style = super.getStyle();
switch (align) {
case SWT.RIGHT:
style |= SWT.RIGHT;
break;
case SWT.CENTER:
style |= SWT.CENTER;
break;
case SWT.LEFT:
style |= SWT.LEFT;
break;
}
return style;
}
public String getText() {
return text;
}
public String getToolTipText() {
checkWidget();
return appToolTipText;
}
public int getTopMargin() {
return topMargin;
}
private void initAccessible() {
Accessible accessible = getAccessible();
accessible.addAccessibleListener(new AccessibleAdapter() {
public void getName(AccessibleEvent e) {
e.result = getText();
}
public void getHelp(AccessibleEvent e) {
e.result = getToolTipText();
}
public void getKeyboardShortcut(AccessibleEvent e) {
char mnemonic = _findMnemonic(GifCLabel.this.text);
if (mnemonic != '\0') {
e.result = "Alt+" + mnemonic;
}
}
});
accessible.addAccessibleControlListener(new AccessibleControlAdapter() {
public void getChildAtPoint(AccessibleControlEvent e) {
e.childID = ACC.CHILDID_SELF;
}
public void getLocation(AccessibleControlEvent e) {
Rectangle rect = getDisplay().map(getParent(), null,
getBounds());
e.x = rect.x;
e.y = rect.y;
e.width = rect.width;
e.height = rect.height;
}
public void getChildCount(AccessibleControlEvent e) {
e.detail = 0;
}
public void getRole(AccessibleControlEvent e) {
e.detail = ACC.ROLE_LABEL;
}
public void getState(AccessibleControlEvent e) {
e.detail = ACC.STATE_READONLY;
}
});
}
void onDispose(Event event) {
if (ignoreDispose) {
ignoreDispose = false;
return;
}
ignoreDispose = true;
notifyListeners(event.type, event);
event.type = SWT.NONE;
gradientColors = null;
gradientPercents = null;
backgroundImage = null;
text = null;
image = null;
appToolTipText = null;
}
void onMnemonic(TraverseEvent event) {
char mnemonic = _findMnemonic(text);
if (mnemonic == '\0')
return;
if (Character.toLowerCase(event.character) != mnemonic)
return;
Composite control = this.getParent();
while (control != null) {
Control[] children = control.getChildren();
int index = 0;
while (index < children.length) {
if (children[index] == this)
break;
index++;
}
index++;
if (index < children.length) {
if (children[index].setFocus()) {
event.doit = true;
event.detail = SWT.TRAVERSE_NONE;
}
}
control = control.getParent();
}
}
void onPaint(PaintEvent event) {
Rectangle rect = getClientArea();
if (rect.width == 0 || rect.height == 0)
return;
boolean shortenText = false;
String t = text;
Image img = image;
int availableWidth = Math.max(0, rect.width
- (leftMargin + rightMargin));
Point extent = getTotalSize(img, t);
if (extent.x > availableWidth) {
img = null;
extent = getTotalSize(img, t);
if (extent.x > availableWidth) {
shortenText = true;
}
}
GC gc = event.gc;
String[] lines = text == null ? null : splitString(text);
// 截断过长文本
if (shortenText) {
extent.x = 0;
for (int i = 0; i < lines.length; i++) {
Point e = gc.textExtent(lines[i], DRAW_FLAGS);
if (e.x > availableWidth) {
lines[i] = shortenText(gc, lines[i], availableWidth);
extent.x = Math.max(extent.x,
getTotalSize(null, lines[i]).x);
} else {
extent.x = Math.max(extent.x, e.x);
}
}
if (appToolTipText == null) {
super.setToolTipText(text);
}
} else {
super.setToolTipText(appToolTipText);
}
// 计算水平位置
int x = rect.x + leftMargin;
if (align == SWT.CENTER) {
x = (rect.width - extent.x) / 2;
}
if (align == SWT.RIGHT) {
x = rect.width - rightMargin - extent.x;
}
// 绘制背景图片，如果设置了背景图片的话
try {
if (backgroundImage != null) {
Rectangle imageRect = backgroundImage.getBounds();
gc.setBackground(getBackground());
gc.fillRectangle(rect);
int xPos = 0;
while (xPos < rect.width) {
int yPos = 0;
while (yPos < rect.height) {
gc.drawImage(backgroundImage, xPos, yPos);
yPos += imageRect.height;
}
xPos += imageRect.width;
}
} else if (gradientColors != null) {
// 绘制渐变效果
final Color oldBackground = gc.getBackground();
if (gradientColors.length == 1) {
if (gradientColors[0] != null)
gc.setBackground(gradientColors[0]);
gc.fillRectangle(0, 0, rect.width, rect.height);
} else {
final Color oldForeground = gc.getForeground();
Color lastColor = gradientColors[0];
if (lastColor == null)
lastColor = oldBackground;
int pos = 0;
for (int i = 0; i < gradientPercents.length; ++i) {
gc.setForeground(lastColor);
lastColor = gradientColors[i + 1];
if (lastColor == null)
lastColor = oldBackground;
gc.setBackground(lastColor);
if (gradientVertical) {
final int gradientHeight = (gradientPercents[i]
* rect.height / 100)
- pos;
gc.fillGradientRectangle(0, pos, rect.width,
gradientHeight, true);
pos += gradientHeight;
} else {
final int gradientWidth = (gradientPercents[i] * rect.width / 100) - pos;
gc.fillGradientRectangle(pos, 0, gradientWidth,
rect.height, false);
pos += gradientWidth;
}
}
if (gradientVertical && pos < rect.height) {
gc.setBackground(getBackground());
gc.fillRectangle(0, pos, rect.width, rect.height - pos);
}
if (!gradientVertical && pos < rect.width) {
gc.setBackground(getBackground());
gc.fillRectangle(pos, 0, rect.width - pos, rect.height);
}
gc.setForeground(oldForeground);
}
gc.setBackground(oldBackground);
} else {
if (background != null
|| (getStyle() & SWT.DOUBLE_BUFFERED) == 0) {
gc.setBackground(getBackground());
gc.fillRectangle(rect);
}
}
} catch (SWTException e) {
if ((getStyle() & SWT.DOUBLE_BUFFERED) == 0) {
gc.setBackground(getBackground());
gc.fillRectangle(rect);
}
}
// 绘制边框
int style = getStyle();
if ((style & SWT.SHADOW_IN) != 0 || (style & SWT.SHADOW_OUT) != 0) {
paintBorder(gc, rect);
}
// 如果文本高度高于图片高度，则从最高点（不包括顶部空白）开始绘制文本，否则绘制图片
Rectangle imageRect = null;
int lineHeight = 0, textHeight = 0, imageHeight = 0;
if (img != null) {
imageRect = img.getBounds();
imageHeight = imageRect.height;
}
if (lines != null) {
lineHeight = gc.getFontMetrics().getHeight();
textHeight = lines.length * lineHeight;
}
int imageY = 0, midPoint = 0, lineY = 0;
if (imageHeight > textHeight) {
if (topMargin == DEFAULT_MARGIN && bottomMargin == DEFAULT_MARGIN)
imageY = rect.y + (rect.height - imageHeight) / 2;
else
imageY = topMargin;
midPoint = imageY + imageHeight / 2;
lineY = midPoint - textHeight / 2;
} else {
if (topMargin == DEFAULT_MARGIN && bottomMargin == DEFAULT_MARGIN)
lineY = rect.y + (rect.height - textHeight) / 2;
else
lineY = topMargin;
midPoint = lineY + textHeight / 2;
imageY = midPoint - imageHeight / 2;
}
// 绘制图片
if (img != null) {
gc.drawImage(img, 0, 0, imageRect.width, imageHeight, x, imageY,
imageRect.width, imageHeight);
x += imageRect.width + GAP;
extent.x -= imageRect.width + GAP;
}
// 绘制文本
if (lines != null) {
gc.setForeground(getForeground());
for (int i = 0; i < lines.length; i++) {
int lineX = x;
if (lines.length > 1) {
if (align == SWT.CENTER) {
int lineWidth = gc.textExtent(lines[i], DRAW_FLAGS).x;
lineX = x + Math.max(0, (extent.x - lineWidth) / 2);
}
if (align == SWT.RIGHT) {
int lineWidth = gc.textExtent(lines[i], DRAW_FLAGS).x;
lineX = Math.max(x, rect.x + rect.width - rightMargin
- lineWidth);
}
}
gc.drawText(lines[i], lineX, lineY, DRAW_FLAGS);
lineY += lineHeight;
}
}
}
/** *//**
* 绘制边框
*/
private void paintBorder(GC gc, Rectangle r) {
Display disp = getDisplay();
Color c1 = null;
Color c2 = null;
int style = getStyle();
if ((style & SWT.SHADOW_IN) != 0) {
c1 = disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
c2 = disp.getSystemColor(SWT.COLOR_WIDGET_HIGHLIGHT_SHADOW);
}
if ((style & SWT.SHADOW_OUT) != 0) {
c1 = disp.getSystemColor(SWT.COLOR_WIDGET_LIGHT_SHADOW);
c2 = disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
}
if (c1 != null && c2 != null) {
gc.setLineWidth(1);
drawBevelRect(gc, r.x, r.y, r.width - 1, r.height - 1, c1, c2);
}
}
/** *//**
* 设置对齐方式
* @param align
*/
public void setAlignment(int align) {
checkWidget();
if (align != SWT.LEFT && align != SWT.RIGHT && align != SWT.CENTER) {
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
if (this.align != align) {
this.align = align;
redraw();
}
}
public void setBackground(Color color) {
super.setBackground(color);
if (backgroundImage == null && gradientColors == null
&& gradientPercents == null) {
if (color == null) {
if (background == null)
return;
} else {
if (color.equals(background))
return;
}
}
background = color;
backgroundImage = null;
gradientColors = null;
gradientPercents = null;
redraw();
}
public void setBackground(Color[] colors, int[] percents) {
setBackground(colors, percents, false);
}
public void setBackground(Color[] colors, int[] percents, boolean vertical) {
checkWidget();
if (colors != null) {
if (percents == null || percents.length != colors.length - 1) {
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
if (getDisplay().getDepth() < 15) {
colors = new Color[] { colors[colors.length - 1] };
percents = new int[] {};
}
for (int i = 0; i < percents.length; i++) {
if (percents[i] < 0 || percents[i] > 100) {
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
if (i > 0 && percents[i] < percents[i - 1]) {
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
}
}
final Color background = getBackground();
if (backgroundImage == null) {
if ((gradientColors != null) && (colors != null)
&& (gradientColors.length == colors.length)) {
boolean same = false;
for (int i = 0; i < gradientColors.length; i++) {
same = (gradientColors[i] == colors[i])
|| ((gradientColors[i] == null) && (colors[i] == background))
|| ((gradientColors[i] == background) && (colors[i] == null));
if (!same)
break;
}
if (same) {
for (int i = 0; i < gradientPercents.length; i++) {
same = gradientPercents[i] == percents[i];
if (!same)
break;
}
}
if (same && this.gradientVertical == vertical)
return;
}
} else {
backgroundImage = null;
}
if (colors == null) {
gradientColors = null;
gradientPercents = null;
gradientVertical = false;
} else {
gradientColors = new Color[colors.length];
for (int i = 0; i < colors.length; ++i)
gradientColors[i] = (colors[i] != null) ? colors[i]
: background;
gradientPercents = new int[percents.length];
for (int i = 0; i < percents.length; ++i)
gradientPercents[i] = percents[i];
gradientVertical = vertical;
}
redraw();
}
public void setBackground(Image image) {
checkWidget();
if (image == backgroundImage)
return;
if (image != null) {
gradientColors = null;
gradientPercents = null;
}
backgroundImage = image;
redraw();
}
public void setBottomMargin(int bottomMargin) {
checkWidget();
if (this.bottomMargin == bottomMargin || bottomMargin < 0)
return;
this.bottomMargin = bottomMargin;
redraw();
}
public void setFont(Font font) {
super.setFont(font);
redraw();
}
public void setImage(Image image) {
checkWidget();
if (thread != null) {
thread.stopRunning();
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
if (image != this.image) {
this.image = image;
redraw();
}
}
public void setGifImage(String path) {
try {
this.setGifImage(new FileInputStream(new File(path)));
} catch (FileNotFoundException e) {
this.image = null;
return;
}
}
public void setGifImage(InputStream inputStream) {
checkWidget();
if (thread != null) {
thread.stopRunning();
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
ImageLoader loader = new ImageLoader();
try {
loader.load(inputStream);
} catch (Exception e) {
this.image = null;
return;
}
if (loader.data[0] != null){
this.image = new Image(this.getDisplay(), loader.data[0]);
}
if (loader.data.length > 1) {
thread = new GifThread(loader);
thread.start();
}
redraw();
}
/** *//**
* Dispose方法被调用时，停止动画线程
*/
@Override
public void dispose() {
super.dispose();
if (thread != null)
thread.stopRunning();
}
/** *//**
* 动画线程，支持一般GIF动画，没有考虑一些特殊情况。
*
* @author ggfan@amarsoft
*/
private class GifThread extends Thread {
private int imageNumber = 0;
private ImageLoader loader = null;
private boolean run = true;
public GifThread(ImageLoader loader) {
this.loader = loader;
}
public void run() {
while (run) {
int delayTime = loader.data[imageNumber].delayTime;
// 采用IE的策略，当延迟时间小于60毫秒时，转换为100毫秒
if(delayTime < 6){
delayTime = 10;
}
try {
Thread.sleep(delayTime * 10);
} catch (InterruptedException e) {
e.printStackTrace();
}
if (!GifCLabel.this.isDisposed()) {
// this new runnable will just be queued
GifCLabel.this.getDisplay().asyncExec(new Runnable() {
public void run() {
// 当这个Runnable获得执行机会的时候，外围的线程可能已经调用过stopRunning()方法了，因此要检查一下。
if(!run){
return;
}
if (!GifCLabel.this.isDisposed()) {
imageNumber = imageNumber == loader.data.length - 1 ? 0 : imageNumber + 1;
if (!GifCLabel.this.image.isDisposed())
GifCLabel.this.image.dispose();
ImageData nextFrameData = loader.data[imageNumber];
GifCLabel.this.image = new Image(GifCLabel.this.getDisplay(), nextFrameData);
GifCLabel.this.redraw();
} else
stopRunning();
}
});
} else
stopRunning();
}
}
public void stopRunning() {
run = false;
}
}
public void setLeftMargin(int leftMargin) {
checkWidget();
if (this.leftMargin == leftMargin || leftMargin < 0)
return;
this.leftMargin = leftMargin;
redraw();
}
public void setMargins(int leftMargin, int topMargin, int rightMargin,
int bottomMargin) {
checkWidget();
this.leftMargin = Math.max(0, leftMargin);
this.topMargin = Math.max(0, topMargin);
this.rightMargin = Math.max(0, rightMargin);
this.bottomMargin = Math.max(0, bottomMargin);
redraw();
}
public void setRightMargin(int rightMargin) {
checkWidget();
if (this.rightMargin == rightMargin || rightMargin < 0)
return;
this.rightMargin = rightMargin;
redraw();
}
public void setText(String text) {
checkWidget();
if (text == null)
text = "";
if (!text.equals(this.text)) {
this.text = text;
redraw();
}
}
public void setToolTipText(String string) {
super.setToolTipText(string);
appToolTipText = super.getToolTipText();
}
public void setTopMargin(int topMargin) {
checkWidget();
if (this.topMargin == topMargin || topMargin < 0)
return;
this.topMargin = topMargin;
redraw();
}
protected String shortenText(GC gc, String t, int width) {
if (t == null)
return null;
int w = gc.textExtent(ELLIPSIS, DRAW_FLAGS).x;
if (width <= w)
return t;
int l = t.length();
int max = l / 2;
int min = 0;
int mid = (max + min) / 2 - 1;
if (mid <= 0)
return t;
TextLayout layout = new TextLayout(getDisplay());
layout.setText(t);
mid = validateOffset(layout, mid);
while (min < mid && mid < max) {
String s1 = t.substring(0, mid);
String s2 = t.substring(validateOffset(layout, l - mid), l);
int l1 = gc.textExtent(s1, DRAW_FLAGS).x;
int l2 = gc.textExtent(s2, DRAW_FLAGS).x;
if (l1 + w + l2 > width) {
max = mid;
mid = validateOffset(layout, (max + min) / 2);
} else if (l1 + w + l2 < width) {
min = mid;
mid = validateOffset(layout, (max + min) / 2);
} else {
min = max;
}
}
String result = mid == 0 ? t : t.substring(0, mid) + ELLIPSIS + t.substring(validateOffset(layout, l - mid), l);
layout.dispose();
return result;
}
int validateOffset(TextLayout layout, int offset) {
int nextOffset = layout.getNextOffset(offset, SWT.MOVEMENT_CLUSTER);
if (nextOffset != offset)
return layout.getPreviousOffset(nextOffset, SWT.MOVEMENT_CLUSTER);
return offset;
}
private String[] splitString(String text) {
String[] lines = new String[1];
int start = 0, pos;
do {
pos = text.indexOf('\n', start);
if (pos == -1) {
lines[lines.length - 1] = text.substring(start);
} else {
boolean crlf = (pos > 0) && (text.charAt(pos - 1) == '\r');
lines[lines.length - 1] = text.substring(start, pos - (crlf ? 1 : 0));
start = pos + 1;
String[] newLines = new String[lines.length + 1];
System.arraycopy(lines, 0, newLines, 0, lines.length);
lines = newLines;
}
} while (pos != -1);
return lines;
}
}不同浏览器对于Gif动画帧延迟的处理方式：
| 浏览器类型 |
区间 |
转换值 |
| Mozila |
<=1 |
10 |
| IE |
<6 |
10 |
| Opera |
<10 |
10 |
| Safari |
<3 |
3 |
posted on 2011-10-11 16:28
West Farmer 阅读(1542)
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Eclipse-RCP