| /* |
| * Copyright (C) 2007 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 android.widget; |
| |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.graphics.Canvas; |
| import android.graphics.Rect; |
| import android.graphics.drawable.Drawable; |
| import android.util.AttributeSet; |
| import android.view.MotionEvent; |
| |
| public abstract class AbsSeekBar extends ProgressBar { |
| |
| private Drawable mThumb; |
| private int mThumbOffset; |
| |
| /** |
| * On touch, this offset plus the scaled value from the position of the |
| * touch will form the progress value. Usually 0. |
| */ |
| float mTouchProgressOffset; |
| |
| /** |
| * Whether this is user seekable. |
| */ |
| boolean mIsUserSeekable = true; |
| |
| private static final int NO_ALPHA = 0xFF; |
| float mDisabledAlpha; |
| |
| public AbsSeekBar(Context context) { |
| super(context); |
| } |
| |
| public AbsSeekBar(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| public AbsSeekBar(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| |
| |
| TypedArray a = context.obtainStyledAttributes(attrs, |
| com.android.internal.R.styleable.SeekBar, defStyle, 0); |
| Drawable thumb = a.getDrawable(com.android.internal.R.styleable.SeekBar_thumb); |
| setThumb(thumb); |
| int thumbOffset = |
| a.getDimensionPixelOffset(com.android.internal.R.styleable.SeekBar_thumbOffset, 0); |
| setThumbOffset(thumbOffset); |
| a.recycle(); |
| |
| a = context.obtainStyledAttributes(attrs, |
| com.android.internal.R.styleable.Theme, 0, 0); |
| mDisabledAlpha = a.getFloat(com.android.internal.R.styleable.Theme_disabledAlpha, 0.5f); |
| a.recycle(); |
| } |
| |
| /** |
| * Sets the thumb that will be drawn at the end of the progress meter within the SeekBar |
| * |
| * @param thumb Drawable representing the thumb |
| */ |
| public void setThumb(Drawable thumb) { |
| if (thumb != null) { |
| thumb.setCallback(this); |
| } |
| mThumb = thumb; |
| invalidate(); |
| } |
| |
| /** |
| * @see #setThumbOffset(int) |
| */ |
| public int getThumbOffset() { |
| return mThumbOffset; |
| } |
| |
| /** |
| * Sets the thumb offset that allows the thumb to extend out of the range of |
| * the track. |
| * |
| * @param thumbOffset The offset amount in pixels. |
| */ |
| public void setThumbOffset(int thumbOffset) { |
| mThumbOffset = thumbOffset; |
| invalidate(); |
| } |
| |
| @Override |
| protected boolean verifyDrawable(Drawable who) { |
| return who == mThumb || super.verifyDrawable(who); |
| } |
| |
| @Override |
| protected void drawableStateChanged() { |
| super.drawableStateChanged(); |
| |
| Drawable progressDrawable = getProgressDrawable(); |
| if (progressDrawable != null) { |
| progressDrawable.setAlpha(isEnabled() ? NO_ALPHA : (int) (NO_ALPHA * mDisabledAlpha)); |
| } |
| } |
| |
| @Override |
| void onProgressRefresh(float scale, boolean fromTouch) { |
| Drawable thumb = mThumb; |
| if (thumb != null) { |
| setThumbPos(getWidth(), getHeight(), thumb, scale, Integer.MIN_VALUE); |
| /* |
| * Since we draw translated, the drawable's bounds that it signals |
| * for invalidation won't be the actual bounds we want invalidated, |
| * so just invalidate this whole view. |
| */ |
| invalidate(); |
| } |
| } |
| |
| |
| @Override |
| protected void onSizeChanged(int w, int h, int oldw, int oldh) { |
| Drawable d = getCurrentDrawable(); |
| Drawable thumb = mThumb; |
| int thumbHeight = thumb == null ? 0 : thumb.getIntrinsicHeight(); |
| // The max height does not incorporate padding, whereas the height |
| // parameter does |
| int trackHeight = Math.min(mMaxHeight, h - mPaddingTop - mPaddingBottom); |
| |
| int max = getMax(); |
| float scale = max > 0 ? (float) getProgress() / (float) max : 0; |
| |
| if (thumbHeight > trackHeight) { |
| if (thumb != null) { |
| setThumbPos(w, h, thumb, scale, 0); |
| } |
| int gapForCenteringTrack = (thumbHeight - trackHeight) / 2; |
| if (d != null) { |
| // Canvas will be translated by the padding, so 0,0 is where we start drawing |
| d.setBounds(0, gapForCenteringTrack, |
| w - mPaddingRight - mPaddingLeft, h - mPaddingBottom - gapForCenteringTrack |
| - mPaddingTop); |
| } |
| } else { |
| if (d != null) { |
| // Canvas will be translated by the padding, so 0,0 is where we start drawing |
| d.setBounds(0, 0, w - mPaddingRight - mPaddingLeft, h - mPaddingBottom |
| - mPaddingTop); |
| } |
| int gap = (trackHeight - thumbHeight) / 2; |
| if (thumb != null) { |
| setThumbPos(w, h, thumb, scale, gap); |
| } |
| } |
| } |
| |
| /** |
| * @param gap If set to {@link Integer#MIN_VALUE}, this will be ignored and |
| * the old vertical bounds will be used. |
| */ |
| private void setThumbPos(int w, int h, Drawable thumb, float scale, int gap) { |
| int available = w - mPaddingLeft - mPaddingRight; |
| int thumbWidth = thumb.getIntrinsicWidth(); |
| int thumbHeight = thumb.getIntrinsicHeight(); |
| available -= thumbWidth; |
| |
| // The extra space for the thumb to move on the track |
| available += mThumbOffset * 2; |
| |
| int thumbPos = (int) (scale * available); |
| |
| int topBound, bottomBound; |
| if (gap == Integer.MIN_VALUE) { |
| Rect oldBounds = thumb.getBounds(); |
| topBound = oldBounds.top; |
| bottomBound = oldBounds.bottom; |
| } else { |
| topBound = gap; |
| bottomBound = gap + thumbHeight; |
| } |
| |
| // Canvas will be translated, so 0,0 is where we start drawing |
| thumb.setBounds(thumbPos, topBound, thumbPos + thumbWidth, bottomBound); |
| } |
| |
| @Override |
| protected synchronized void onDraw(Canvas canvas) { |
| super.onDraw(canvas); |
| if (mThumb != null) { |
| canvas.save(); |
| // Translate the padding. For the x, we need to allow the thumb to |
| // draw in its extra space |
| canvas.translate(mPaddingLeft - mThumbOffset, mPaddingTop); |
| mThumb.draw(canvas); |
| canvas.restore(); |
| } |
| } |
| |
| @Override |
| protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| Drawable d = getCurrentDrawable(); |
| |
| int thumbHeight = mThumb == null ? 0 : mThumb.getIntrinsicHeight(); |
| int dw = 0; |
| int dh = 0; |
| if (d != null) { |
| dw = Math.max(mMinWidth, Math.min(mMaxWidth, d.getIntrinsicWidth())); |
| dh = Math.max(mMinHeight, Math.min(mMaxHeight, d.getIntrinsicHeight())); |
| dh = Math.max(thumbHeight, dh); |
| } |
| dw += mPaddingLeft + mPaddingRight; |
| dh += mPaddingTop + mPaddingBottom; |
| |
| setMeasuredDimension(resolveSize(dw, widthMeasureSpec), |
| resolveSize(dh, heightMeasureSpec)); |
| } |
| |
| @Override |
| public boolean onTouchEvent(MotionEvent event) { |
| if (!mIsUserSeekable || !isEnabled()) { |
| return false; |
| } |
| |
| switch (event.getAction()) { |
| case MotionEvent.ACTION_DOWN: |
| onStartTrackingTouch(); |
| trackTouchEvent(event); |
| break; |
| |
| case MotionEvent.ACTION_MOVE: |
| trackTouchEvent(event); |
| break; |
| |
| case MotionEvent.ACTION_UP: |
| trackTouchEvent(event); |
| onStopTrackingTouch(); |
| break; |
| |
| case MotionEvent.ACTION_CANCEL: |
| onStopTrackingTouch(); |
| break; |
| } |
| return true; |
| } |
| |
| private void trackTouchEvent(MotionEvent event) { |
| final int width = getWidth(); |
| final int available = width - mPaddingLeft - mPaddingRight; |
| int x = (int)event.getX(); |
| float scale; |
| float progress = 0; |
| if (x < mPaddingLeft) { |
| scale = 0.0f; |
| } else if (x > width - mPaddingRight) { |
| scale = 1.0f; |
| } else { |
| scale = (float)(x - mPaddingLeft) / (float)available; |
| progress = mTouchProgressOffset; |
| } |
| |
| final int max = getMax(); |
| progress += scale * max; |
| if (progress < 0) { |
| progress = 0; |
| } else if (progress > max) { |
| progress = max; |
| } |
| |
| setProgress((int) progress, true); |
| } |
| |
| /** |
| * This is called when the user has started touching this widget. |
| */ |
| void onStartTrackingTouch() { |
| } |
| |
| /** |
| * This is called when the user either releases his touch or the touch is |
| * canceled. |
| */ |
| void onStopTrackingTouch() { |
| } |
| |
| } |