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我保存的圖像中的字符串,然後當我打開它,它總是300x150GWT畫布 - 保存圖像並打開它
爲什麼圖像截斷?
300x150從哪裏來?
代碼就是你所看到的。只有2個按鈕。在「PNG」
第一個保存圖像,而另一個從「PNG」
Button save = new Button("copy");
save.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
ImageElement imageElement = ImageElement.as(image.getElement());
Canvas canvasTmp = Canvas.createIfSupported();
Context2d context = canvasTmp.getContext2d();
context.drawImage(imageElement, 0.0, 0.0, imageElement.getWidth(), imageElement.getHeight());
png = canvasTmp.toDataUrl("image/png");
}
});
Button open = new Button("open");
open.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
final Image image = new Image(png);
vp.add(image);
image.addLoadHandler(new LoadHandler() {
@Override
public void onLoad(LoadEvent event)
{
Window.alert("ok");
}
});
image.addErrorHandler(new ErrorHandler() {
@Override
public void onError(ErrorEvent event) {
Window.alert("error");
}
});
}
});
非常感謝! – Spiff 2012-07-18 15:10:48