| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| package org.mozc.android.inputmethod.japanese.ui; |
| |
| import org.mozc.android.inputmethod.japanese.resources.R; |
| import org.mozc.android.inputmethod.japanese.view.RectKeyDrawable; |
| import org.mozc.android.inputmethod.japanese.view.Skin; |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Optional; |
| import com.google.common.base.Preconditions; |
| |
| import android.content.Context; |
| import android.content.res.Resources; |
| import android.graphics.Canvas; |
| import android.graphics.drawable.Drawable; |
| import android.util.AttributeSet; |
| import android.view.View; |
| |
| /** |
| * Skin-aware vertical indicator to represent the current scroller's position. |
| * |
| */ |
| public class ScrollGuideView extends View { |
| |
| private final int scrollBarMinimumHeight = getScrollBarMinimumHeight(getResources()); |
| private Optional<SnapScroller> snapScroller = Optional.absent(); |
| private Skin skin = Skin.getFallbackInstance(); |
| @VisibleForTesting Drawable scrollBarDrawable = createScrollBarDrawable(skin); |
| |
| public ScrollGuideView(Context context) { |
| super(context); |
| } |
| |
| public ScrollGuideView(Context context, AttributeSet attributeSet) { |
| super(context, attributeSet); |
| } |
| |
| public ScrollGuideView(Context context, AttributeSet attributeSet, int defStyle) { |
| super(context, attributeSet, defStyle); |
| } |
| |
| private static Drawable createScrollBarDrawable(Skin skin) { |
| // TODO(hidehiko): Probably we should rename the RectKeyDrawable, |
| // because this usage is not the key but actually we can reuse the code as is. |
| return new RectKeyDrawable(1, 0, 1, 1, |
| skin.candidateScrollBarTopColor, |
| skin.candidateScrollBarBottomColor, |
| 0, 0, 0, 0); |
| } |
| |
| private static int getScrollBarMinimumHeight(Resources resources) { |
| Preconditions.checkNotNull(resources); |
| return resources.getDimensionPixelSize(R.dimen.candidate_scrollbar_minimum_height); |
| } |
| |
| /** Sets the skin type, and regenerates an indicator drawable if necessary. */ |
| @SuppressWarnings("deprecation") |
| public void setSkin(Skin skin) { |
| Preconditions.checkNotNull(skin); |
| if (this.skin.equals(skin)) { |
| return; |
| } |
| this.skin = skin; |
| scrollBarDrawable = createScrollBarDrawable(skin); |
| setBackgroundDrawable(skin.scrollBarBackgroundDrawable.getConstantState().newDrawable()); |
| invalidate(); |
| } |
| |
| /** Attaches a {@link SnapScroller} instance to this view. */ |
| public void setScroller(SnapScroller scroller) { |
| this.snapScroller = Optional.of(Preconditions.checkNotNull(scroller)); |
| invalidate(); |
| } |
| |
| @Override |
| protected void onDraw(Canvas canvas) { |
| super.onDraw(canvas); |
| |
| // Paint the scroll bar. |
| if (!snapScroller.isPresent()) { |
| return; |
| } |
| SnapScroller scroller = snapScroller.get(); |
| |
| int contentSize = Math.max( |
| scroller.getContentSize(), scroller.getMaxScrollPosition() + scroller.getViewSize()); |
| if (contentSize == 0) { |
| return; |
| } |
| |
| int height = getHeight(); |
| |
| // Ceil the slide bar's size. |
| int length = Math.max( |
| (height * scroller.getViewSize() + contentSize - 1) / contentSize, |
| scrollBarMinimumHeight); |
| if (length == 0) { |
| return; |
| } |
| int maxScrollPosition = scroller.getMaxScrollPosition(); |
| int top = (maxScrollPosition == 0) |
| ? 0 |
| : (height - length) * scroller.getScrollPosition() / maxScrollPosition; |
| scrollBarDrawable.setBounds(0, top, getWidth(), top + length); |
| scrollBarDrawable.draw(canvas); |
| } |
| } |