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/*
* Copyright (C) 2011 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.camera.ui;
import com.android.camera.R;
import com.android.camera.Util;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
/**
* A view that contains camera zoom control and its layout.
*/
public class ZoomControlBar extends ZoomControl {
private static final String TAG = "ZoomControlBar";
private static final int THRESHOLD_FIRST_MOVE = Util.dpToPixel(10); // pixels
// Space between indicator icon and the zoom-in/out icon.
private static final int ICON_SPACING = Util.dpToPixel(12);
private View mBar;
private boolean mStartChanging;
private int mSliderPosition = 0;
private int mSliderLength;
private int mWidth;
private int mIconWidth;
private int mTotalIconWidth;
public ZoomControlBar(Context context, AttributeSet attrs) {
super(context, attrs);
mBar = new View(context);
mBar.setBackgroundResource(R.drawable.zoom_slider_bar);
addView(mBar);
}
@Override
public void setActivated(boolean activated) {
super.setActivated(activated);
mBar.setActivated(activated);
}
private int getSliderPosition(int x) {
// Calculate the absolute offset of the slider in the zoom control bar.
// For left-hand users, as the device is rotated for 180 degree for
// landscape mode, the zoom-in bottom should be on the top, so the
// position should be reversed.
int pos; // the relative position in the zoom slider bar
if (mOrientation == 90) {
pos = mWidth - mTotalIconWidth - x;
} else {
pos = x - mTotalIconWidth;
}
if (pos < 0) pos = 0;
if (pos > mSliderLength) pos = mSliderLength;
return pos;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mWidth = w;
mIconWidth = mZoomIn.getMeasuredWidth();
mTotalIconWidth = mIconWidth + ICON_SPACING;
mSliderLength = mWidth - (2 * mTotalIconWidth);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
if (!isEnabled() || (mWidth == 0)) return false;
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_OUTSIDE:
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
setActivated(false);
closeZoomControl();
break;
case MotionEvent.ACTION_DOWN:
setActivated(true);
mStartChanging = false;
case MotionEvent.ACTION_MOVE:
int pos = getSliderPosition((int) event.getX());
if (!mStartChanging) {
// Make sure the movement is large enough before we start
// changing the zoom.
int delta = mSliderPosition - pos;
if ((delta > THRESHOLD_FIRST_MOVE) ||
(delta < -THRESHOLD_FIRST_MOVE)) {
mStartChanging = true;
}
}
if (mStartChanging) {
performZoom(1.0d * pos / mSliderLength);
mSliderPosition = pos;
}
requestLayout();
}
return true;
}
@Override
public void setOrientation(int orientation) {
// layout for the left-hand camera control
if ((orientation == 90) || (mOrientation == 90)) requestLayout();
super.setOrientation(orientation);
}
@Override
protected void onLayout(
boolean changed, int left, int top, int right, int bottom) {
if (mZoomMax == 0) return;
int height = bottom - top;
mBar.layout(mTotalIconWidth, 0, mWidth - mTotalIconWidth, height);
// For left-hand users, as the device is rotated for 180 degree,
// the zoom-in button should be on the top.
int pos; // slider position
int sliderPosition;
if (mSliderPosition != -1) { // -1 means invalid
sliderPosition = mSliderPosition;
} else {
sliderPosition = (int) ((double) mSliderLength * mZoomIndex / mZoomMax);
}
if (mOrientation == 90) {
mZoomIn.layout(0, 0, mIconWidth, height);
mZoomOut.layout(mWidth - mIconWidth, 0, mWidth, height);
pos = mBar.getRight() - sliderPosition;
} else {
mZoomOut.layout(0, 0, mIconWidth, height);
mZoomIn.layout(mWidth - mIconWidth, 0, mWidth, height);
pos = mBar.getLeft() + sliderPosition;
}
int sliderWidth = mZoomSlider.getMeasuredWidth();
mZoomSlider.layout((pos - sliderWidth / 2), 0,
(pos + sliderWidth / 2), height);
}
@Override
public void setZoomIndex(int index) {
super.setZoomIndex(index);
mSliderPosition = -1; // -1 means invalid
requestLayout();
}
}
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