Board index
FAQ
Register
Login
The following class wraps a Drawable resource to use as a background for a View without stretching. Adjust the padding as desired.
Using java Syntax Highlighting
- public class NonScalingBackgroundDrawable extends Drawable {
- int padding_top = 30;
- int padding_bottom = 10;
- int padding_left = 20;
- int padding_right = 10;
- Context context;
- View view;
- Drawable hosted_drawable;
- public NonScalingBackgroundDrawable(Context c, View v, int resource) {
- context = c;
- view = v;
- hosted_drawable = context.getResources().getDrawable(resource);
- }
- public void draw(Canvas canvas) {
- int w = hosted_drawable.getIntrinsicWidth();
- int h = hosted_drawable.getIntrinsicHeight();
- int view_w = view.getWidth();
- int view_h = view.getHeight();
- int padded_horizontal_room = view_w - (padding_left + padding_right);
- int padded_vertical_room = view_h - (padding_top + padding_bottom);
- float scale;
- float intrinsic_aspect_ratio = w / (float) h;
- float padded_canvas_aspect_ratio = padded_horizontal_room / (float) padded_vertical_room;
- if (intrinsic_aspect_ratio > padded_canvas_aspect_ratio)
- // Our source image is wider than the canvas, so we scale by width.
- scale = padded_horizontal_room / (float) w;
- else
- scale = padded_vertical_room / (float) h;
- int scaled_width = (int) (scale*w);
- int scaled_height = (int) (scale*h);
- // Here we fit the image into the bottom-right corner.
- int left = view_w - scaled_width - padding_right;
- int top = view_h - scaled_height - padding_bottom;
- int right = view_w - padding_right;
- int bottom = view_h - padding_bottom;
- hosted_drawable.setBounds(
- left,
- top,
- right,
- bottom
- );
- hosted_drawable.draw(canvas);
- }
- public int getOpacity() {
- return hosted_drawable.getOpacity();
- }
- public void setAlpha(int alpha) {
- hosted_drawable.setAlpha(alpha);
- }
- public void setColorFilter(ColorFilter cf) {
- hosted_drawable.setColorFilter(cf);
- }
- }
Parsed in 0.036 seconds, using GeSHi 1.0.8.4
