290 lines
10 KiB
Java
290 lines
10 KiB
Java
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.view.animation;
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import android.content.Context;
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import android.content.res.Resources;
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import android.content.res.TypedArray;
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import android.util.AttributeSet;
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import android.util.TypedValue;
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/**
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* An animation that controls the scale of an object. You can specify the point
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* to use for the center of scaling.
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*
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*/
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public class ScaleAnimation extends Animation {
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private final Resources mResources;
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private float mFromX;
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private float mToX;
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private float mFromY;
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private float mToY;
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private int mFromXType = TypedValue.TYPE_NULL;
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private int mToXType = TypedValue.TYPE_NULL;
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private int mFromYType = TypedValue.TYPE_NULL;
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private int mToYType = TypedValue.TYPE_NULL;
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private int mFromXData = 0;
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private int mToXData = 0;
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private int mFromYData = 0;
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private int mToYData = 0;
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private int mPivotXType = ABSOLUTE;
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private int mPivotYType = ABSOLUTE;
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private float mPivotXValue = 0.0f;
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private float mPivotYValue = 0.0f;
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private float mPivotX;
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private float mPivotY;
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/**
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* Constructor used when a ScaleAnimation is loaded from a resource.
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*
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* @param context Application context to use
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* @param attrs Attribute set from which to read values
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*/
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public ScaleAnimation(Context context, AttributeSet attrs) {
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super(context, attrs);
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mResources = context.getResources();
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TypedArray a = context.obtainStyledAttributes(attrs,
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com.android.internal.R.styleable.ScaleAnimation);
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TypedValue tv = a.peekValue(
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com.android.internal.R.styleable.ScaleAnimation_fromXScale);
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mFromX = 0.0f;
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if (tv != null) {
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if (tv.type == TypedValue.TYPE_FLOAT) {
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// This is a scaling factor.
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mFromX = tv.getFloat();
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} else {
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mFromXType = tv.type;
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mFromXData = tv.data;
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}
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}
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tv = a.peekValue(
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com.android.internal.R.styleable.ScaleAnimation_toXScale);
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mToX = 0.0f;
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if (tv != null) {
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if (tv.type == TypedValue.TYPE_FLOAT) {
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// This is a scaling factor.
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mToX = tv.getFloat();
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} else {
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mToXType = tv.type;
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mToXData = tv.data;
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}
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}
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tv = a.peekValue(
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com.android.internal.R.styleable.ScaleAnimation_fromYScale);
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mFromY = 0.0f;
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if (tv != null) {
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if (tv.type == TypedValue.TYPE_FLOAT) {
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// This is a scaling factor.
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mFromY = tv.getFloat();
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} else {
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mFromYType = tv.type;
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mFromYData = tv.data;
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}
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}
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tv = a.peekValue(
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com.android.internal.R.styleable.ScaleAnimation_toYScale);
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mToY = 0.0f;
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if (tv != null) {
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if (tv.type == TypedValue.TYPE_FLOAT) {
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// This is a scaling factor.
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mToY = tv.getFloat();
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} else {
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mToYType = tv.type;
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mToYData = tv.data;
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}
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}
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Description d = Description.parseValue(a.peekValue(
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com.android.internal.R.styleable.ScaleAnimation_pivotX), context);
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mPivotXType = d.type;
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mPivotXValue = d.value;
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d = Description.parseValue(a.peekValue(
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com.android.internal.R.styleable.ScaleAnimation_pivotY), context);
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mPivotYType = d.type;
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mPivotYValue = d.value;
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a.recycle();
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initializePivotPoint();
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}
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/**
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* Constructor to use when building a ScaleAnimation from code
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*
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* @param fromX Horizontal scaling factor to apply at the start of the
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* animation
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* @param toX Horizontal scaling factor to apply at the end of the animation
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* @param fromY Vertical scaling factor to apply at the start of the
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* animation
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* @param toY Vertical scaling factor to apply at the end of the animation
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*/
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public ScaleAnimation(float fromX, float toX, float fromY, float toY) {
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mResources = null;
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mFromX = fromX;
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mToX = toX;
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mFromY = fromY;
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mToY = toY;
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mPivotX = 0;
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mPivotY = 0;
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}
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/**
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* Constructor to use when building a ScaleAnimation from code
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*
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* @param fromX Horizontal scaling factor to apply at the start of the
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* animation
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* @param toX Horizontal scaling factor to apply at the end of the animation
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* @param fromY Vertical scaling factor to apply at the start of the
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* animation
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* @param toY Vertical scaling factor to apply at the end of the animation
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* @param pivotX The X coordinate of the point about which the object is
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* being scaled, specified as an absolute number where 0 is the left
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* edge. (This point remains fixed while the object changes size.)
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* @param pivotY The Y coordinate of the point about which the object is
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* being scaled, specified as an absolute number where 0 is the top
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* edge. (This point remains fixed while the object changes size.)
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*/
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public ScaleAnimation(float fromX, float toX, float fromY, float toY,
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float pivotX, float pivotY) {
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mResources = null;
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mFromX = fromX;
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mToX = toX;
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mFromY = fromY;
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mToY = toY;
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mPivotXType = ABSOLUTE;
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mPivotYType = ABSOLUTE;
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mPivotXValue = pivotX;
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mPivotYValue = pivotY;
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initializePivotPoint();
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}
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/**
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* Constructor to use when building a ScaleAnimation from code
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*
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* @param fromX Horizontal scaling factor to apply at the start of the
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* animation
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* @param toX Horizontal scaling factor to apply at the end of the animation
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* @param fromY Vertical scaling factor to apply at the start of the
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* animation
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* @param toY Vertical scaling factor to apply at the end of the animation
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* @param pivotXType Specifies how pivotXValue should be interpreted. One of
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* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
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* Animation.RELATIVE_TO_PARENT.
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* @param pivotXValue The X coordinate of the point about which the object
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* is being scaled, specified as an absolute number where 0 is the
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* left edge. (This point remains fixed while the object changes
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* size.) This value can either be an absolute number if pivotXType
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* is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
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* @param pivotYType Specifies how pivotYValue should be interpreted. One of
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* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
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* Animation.RELATIVE_TO_PARENT.
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* @param pivotYValue The Y coordinate of the point about which the object
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* is being scaled, specified as an absolute number where 0 is the
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* top edge. (This point remains fixed while the object changes
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* size.) This value can either be an absolute number if pivotYType
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* is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
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*/
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public ScaleAnimation(float fromX, float toX, float fromY, float toY,
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int pivotXType, float pivotXValue, int pivotYType, float pivotYValue) {
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mResources = null;
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mFromX = fromX;
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mToX = toX;
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mFromY = fromY;
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mToY = toY;
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mPivotXValue = pivotXValue;
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mPivotXType = pivotXType;
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mPivotYValue = pivotYValue;
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mPivotYType = pivotYType;
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initializePivotPoint();
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}
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/**
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* Called at the end of constructor methods to initialize, if possible, values for
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* the pivot point. This is only possible for ABSOLUTE pivot values.
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*/
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private void initializePivotPoint() {
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if (mPivotXType == ABSOLUTE) {
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mPivotX = mPivotXValue;
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}
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if (mPivotYType == ABSOLUTE) {
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mPivotY = mPivotYValue;
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}
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}
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@Override
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protected void applyTransformation(float interpolatedTime, Transformation t) {
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float sx = 1.0f;
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float sy = 1.0f;
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float scale = getScaleFactor();
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if (mFromX != 1.0f || mToX != 1.0f) {
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sx = mFromX + ((mToX - mFromX) * interpolatedTime);
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}
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if (mFromY != 1.0f || mToY != 1.0f) {
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sy = mFromY + ((mToY - mFromY) * interpolatedTime);
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}
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if (mPivotX == 0 && mPivotY == 0) {
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t.getMatrix().setScale(sx, sy);
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} else {
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t.getMatrix().setScale(sx, sy, scale * mPivotX, scale * mPivotY);
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}
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}
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float resolveScale(float scale, int type, int data, int size, int psize) {
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float targetSize;
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if (type == TypedValue.TYPE_FRACTION) {
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targetSize = TypedValue.complexToFraction(data, size, psize);
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} else if (type == TypedValue.TYPE_DIMENSION) {
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targetSize = TypedValue.complexToDimension(data, mResources.getDisplayMetrics());
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} else {
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return scale;
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}
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if (size == 0) {
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return 1;
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}
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return targetSize/(float)size;
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}
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@Override
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public void initialize(int width, int height, int parentWidth, int parentHeight) {
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super.initialize(width, height, parentWidth, parentHeight);
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mFromX = resolveScale(mFromX, mFromXType, mFromXData, width, parentWidth);
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mToX = resolveScale(mToX, mToXType, mToXData, width, parentWidth);
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mFromY = resolveScale(mFromY, mFromYType, mFromYData, height, parentHeight);
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mToY = resolveScale(mToY, mToYType, mToYData, height, parentHeight);
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mPivotX = resolveSize(mPivotXType, mPivotXValue, width, parentWidth);
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mPivotY = resolveSize(mPivotYType, mPivotYValue, height, parentHeight);
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}
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}
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