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/*
* Copyright (C) 2012 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.gallery3d.ui;
import android.content.Context;
import android.view.MotionEvent;
import com.android.gallery3d.R;
import com.android.gallery3d.common.Utils;
import com.android.gallery3d.glrenderer.GLCanvas;
import com.android.gallery3d.glrenderer.NinePatchTexture;
import com.android.gallery3d.glrenderer.ResourceTexture;
import com.android.gallery3d.glrenderer.StringTexture;
import com.android.gallery3d.util.GalleryUtils;
public class UndoBarView extends GLView {
@SuppressWarnings("unused")
private static final String TAG = "UndoBarView";
private static final int WHITE = 0xFFFFFFFF;
private static final int GRAY = 0xFFAAAAAA;
private final NinePatchTexture mPanel;
private final StringTexture mUndoText;
private final StringTexture mDeletedText;
private final ResourceTexture mUndoIcon;
private final int mBarHeight;
private final int mBarMargin;
private final int mUndoTextMargin;
private final int mIconSize;
private final int mIconMargin;
private final int mSeparatorTopMargin;
private final int mSeparatorBottomMargin;
private final int mSeparatorRightMargin;
private final int mSeparatorWidth;
private final int mDeletedTextMargin;
private final int mClickRegion;
private OnClickListener mOnClickListener;
private boolean mDownOnButton;
// This is the layout of UndoBarView. The unit is dp.
//
// +-+----+----------------+-+--+----+-+------+--+-+
// 48 | | | Deleted | | | <- | | UNDO | | |
// +-+----+----------------+-+--+----+-+------+--+-+
// 4 16 1 12 32 8 16 4
public UndoBarView(Context context) {
mBarHeight = GalleryUtils.dpToPixel(48);
mBarMargin = GalleryUtils.dpToPixel(4);
mUndoTextMargin = GalleryUtils.dpToPixel(16);
mIconMargin = GalleryUtils.dpToPixel(8);
mIconSize = GalleryUtils.dpToPixel(32);
mSeparatorRightMargin = GalleryUtils.dpToPixel(12);
mSeparatorTopMargin = GalleryUtils.dpToPixel(10);
mSeparatorBottomMargin = GalleryUtils.dpToPixel(10);
mSeparatorWidth = GalleryUtils.dpToPixel(1);
mDeletedTextMargin = GalleryUtils.dpToPixel(16);
mPanel = new NinePatchTexture(context, R.drawable.panel_undo_holo);
mUndoText = StringTexture.newInstance(context.getString(R.string.undo),
GalleryUtils.dpToPixel(12), GRAY, 0, true);
mDeletedText = StringTexture.newInstance(
context.getString(R.string.deleted),
GalleryUtils.dpToPixel(16), WHITE);
mUndoIcon = new ResourceTexture(
context, R.drawable.ic_menu_revert_holo_dark);
mClickRegion = mBarMargin + mUndoTextMargin + mUndoText.getWidth()
+ mIconMargin + mIconSize + mSeparatorRightMargin;
}
public void setOnClickListener(OnClickListener listener) {
mOnClickListener = listener;
}
@Override
protected void onMeasure(int widthSpec, int heightSpec) {
setMeasuredSize(0 /* unused */, mBarHeight);
}
@Override
protected void render(GLCanvas canvas) {
super.render(canvas);
advanceAnimation();
canvas.save(GLCanvas.SAVE_FLAG_ALPHA);
canvas.multiplyAlpha(mAlpha);
int w = getWidth();
int h = getHeight();
mPanel.draw(canvas, mBarMargin, 0, w - mBarMargin * 2, mBarHeight);
int x = w - mBarMargin;
int y;
x -= mUndoTextMargin + mUndoText.getWidth();
y = (mBarHeight - mUndoText.getHeight()) / 2;
mUndoText.draw(canvas, x, y);
x -= mIconMargin + mIconSize;
y = (mBarHeight - mIconSize) / 2;
mUndoIcon.draw(canvas, x, y, mIconSize, mIconSize);
x -= mSeparatorRightMargin + mSeparatorWidth;
y = mSeparatorTopMargin;
canvas.fillRect(x, y, mSeparatorWidth,
mBarHeight - mSeparatorTopMargin - mSeparatorBottomMargin, GRAY);
x = mBarMargin + mDeletedTextMargin;
y = (mBarHeight - mDeletedText.getHeight()) / 2;
mDeletedText.draw(canvas, x, y);
canvas.restore();
}
@Override
protected boolean onTouch(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mDownOnButton = inUndoButton(event);
break;
case MotionEvent.ACTION_UP:
if (mDownOnButton) {
if (mOnClickListener != null && inUndoButton(event)) {
mOnClickListener.onClick(this);
}
mDownOnButton = false;
}
break;
case MotionEvent.ACTION_CANCEL:
mDownOnButton = false;
break;
}
return true;
}
// Check if the event is on the right of the separator
private boolean inUndoButton(MotionEvent event) {
float x = event.getX();
float y = event.getY();
int w = getWidth();
int h = getHeight();
return (x >= w - mClickRegion && x < w && y >= 0 && y < h);
}
////////////////////////////////////////////////////////////////////////////
// Alpha Animation
////////////////////////////////////////////////////////////////////////////
private static final long NO_ANIMATION = -1;
private static long ANIM_TIME = 200;
private long mAnimationStartTime = NO_ANIMATION;
private float mFromAlpha, mToAlpha;
private float mAlpha;
private static float getTargetAlpha(int visibility) {
return (visibility == VISIBLE) ? 1f : 0f;
}
@Override
public void setVisibility(int visibility) {
mAlpha = getTargetAlpha(visibility);
mAnimationStartTime = NO_ANIMATION;
super.setVisibility(visibility);
invalidate();
}
public void animateVisibility(int visibility) {
float target = getTargetAlpha(visibility);
if (mAnimationStartTime == NO_ANIMATION && mAlpha == target) return;
if (mAnimationStartTime != NO_ANIMATION && mToAlpha == target) return;
mFromAlpha = mAlpha;
mToAlpha = target;
mAnimationStartTime = AnimationTime.startTime();
super.setVisibility(VISIBLE);
invalidate();
}
private void advanceAnimation() {
if (mAnimationStartTime == NO_ANIMATION) return;
float delta = (float) (AnimationTime.get() - mAnimationStartTime) /
ANIM_TIME;
mAlpha = mFromAlpha + ((mToAlpha > mFromAlpha) ? delta : -delta);
mAlpha = Utils.clamp(mAlpha, 0f, 1f);
if (mAlpha == mToAlpha) {
mAnimationStartTime = NO_ANIMATION;
if (mAlpha == 0) {
super.setVisibility(INVISIBLE);
}
}
invalidate();
}
}
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