查看不适合在画布上规模画布 [英] View does not fit the canvas on canvas scale

问题描述

当我试图扩大我的画布，以一场平局SCALED观点，我的观点实际上是按比例，但鉴于是越来越剪裁。 （可能是因为它的布局参数？）

When I'm trying to scale my canvas to a draw SCALED view, my view is actually scaled, but view is getting clipped. (probably because of its layout parameters?)

public void onDraw(Canvas canvas) {
    canvas.scale(2f, 2f);
    view.draw(canvas);
}

简单的图片：

simple image:

图像后，新的OnDraw调用，例如，当我点击这个按钮：

image after new onDraw called, for example when I click this button:

按钮应该是全尺寸的帆布时缩放。你有什么想法如何解决呢？

The button should be full sized when canvas is scaled. Do you have any ideas how to solve it?

P.S。呼叫

view.invalidate();
view.requestLayout();

没有帮助。

我用 MyDragShadowBuilder ，因为我想我的看法是双尺寸，当我拖动视图。

I'm using MyDragShadowBuilder because I want my view to be double sized when I drag the view.

private final class MyDragShadowBuilder extends DragShadowBuilder {

        public MyDragShadowBuilder(View view) {
            super(view);
        }

        @Override
        public void onDrawShadow(Canvas canvas) {
            final View view = getView();
            if (view != null) {
                canvas.scale(2f, 2f);
                view.draw(canvas);
            } else {
                Log.e("DragShadowBuilder", "Asked to draw drag shadow but no view");
            }
        }

我想补充我的看法到我绝对布局的实现与WRAP_CONTENT布局属性。

I add my view into my Absolute Layout implementation with WRAP_CONTENT layout properties

推荐答案

我遇到了同样的麻烦。过了一段时间我找到了一种方法，使其工作:) 这个缩放由4倍的原始图。

I ran into the same trouble. After some time i found a way to make it work :) This scales the original view by a factor of 4.

private static class MyDragShadowBuilder extends View.DragShadowBuilder {

    private static final int SCALING_FACTOR = 4;

    public MyDragShadowBuilder(View view) {
        super(view);
    }

    @Override
    public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) {
        View v = getView();
        final int width = v.getWidth() * SCALING_FACTOR;
        final int height = v.getHeight() * SCALING_FACTOR;
        shadowSize.set(width, height);
        shadowTouchPoint.set(width / 2, height / 2);
    }

    @Override
    public void onDrawShadow(Canvas canvas) {
        canvas.scale(SCALING_FACTOR, SCALING_FACTOR);
        getView().draw(canvas);
    }

}

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