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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.mail.ui;
import android.graphics.Bitmap;
/**
* A canvas to draw loaded photos.
*/
public interface ImageCanvas {
/**
* Dimensions holds the desired width, height, and scale for a bitmap being
* placed in the ImageCanvas.
*/
public static class Dimensions {
public int width;
public int height;
public float scale;
public float fontSize;
public static final float SCALE_ONE = 1.0f;
public static final float SCALE_HALF = 0.5f;
public static final float SCALE_QUARTER = 0.25f;
public Dimensions() {
}
public Dimensions(int w, int h, float s) {
this(w, h, s, -1f);
}
public Dimensions(int width, int height, float scale, float fontSize) {
this.width = width;
this.height = height;
this.scale = scale;
this.fontSize = fontSize;
}
@Override
public String toString() {
return String.format("Dimens [%d x %d]", width, height);
}
}
/**
* Draw/composite the given Bitmap corresponding with the key 'id'. It will be sized according
* to whatever {@link #getDesiredDimensions(Object, Dimensions)} reported when the
* decode request was made.
*
* @param decoded an exactly-sized, decoded bitmap to display
* @param key
*/
void drawImage(Bitmap decoded, Object key);
/**
* Reset all state associated with this view so that it can be reused.
*/
void reset();
/**
* Outputs the desired dimensions that the object with key 'id' would like to be drawn to.
*
* @param key
* @param outDim caller-allocated {@link Dimensions} object to house the result
*/
void getDesiredDimensions(Object key, Dimensions outDim);
/**
* Return an arbitrary integer to associate with any asynchronous requests for images that
* currently belong to this canvas. If, later on when results are available, the generation
* that is then reported does not match, the photo manager will assume the image is no longer
* desired and will not offer the image.
* <p>
* Implementors should basically treat this as a counter to increment upon reset() or
* data binding.
*/
int getGeneration();
}
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