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/*
* Copyright (C) 2014 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 org.kelar.inputmethod.keyboard.internal;
import android.content.Context;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.text.TextPaint;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.widget.TextView;
import org.kelar.inputmethod.keyboard.Key;
import org.kelar.inputmethod.latin.R;
import java.util.HashSet;
/**
* The pop up key preview view.
*/
public class KeyPreviewView extends TextView {
public static final int POSITION_MIDDLE = 0;
public static final int POSITION_LEFT = 1;
public static final int POSITION_RIGHT = 2;
private final Rect mBackgroundPadding = new Rect();
private static final HashSet<String> sNoScaleXTextSet = new HashSet<>();
public KeyPreviewView(final Context context, final AttributeSet attrs) {
this(context, attrs, 0);
}
public KeyPreviewView(final Context context, final AttributeSet attrs, final int defStyleAttr) {
super(context, attrs, defStyleAttr);
setGravity(Gravity.CENTER);
}
public void setPreviewVisual(final Key key, final KeyboardIconsSet iconsSet,
final KeyDrawParams drawParams) {
// What we show as preview should match what we show on a key top in onDraw().
final int iconId = key.getIconId();
if (iconId != KeyboardIconsSet.ICON_UNDEFINED) {
setCompoundDrawables(null, null, null, key.getPreviewIcon(iconsSet));
setText(null);
return;
}
setCompoundDrawables(null, null, null, null);
setTextColor(drawParams.mPreviewTextColor);
setTextSize(TypedValue.COMPLEX_UNIT_PX, key.selectPreviewTextSize(drawParams));
setTypeface(key.selectPreviewTypeface(drawParams));
// TODO Should take care of temporaryShiftLabel here.
setTextAndScaleX(key.getPreviewLabel());
}
private void setTextAndScaleX(final String text) {
setTextScaleX(1.0f);
setText(text);
if (sNoScaleXTextSet.contains(text)) {
return;
}
// TODO: Override {@link #setBackground(Drawable)} that is supported from API 16 and
// calculate maximum text width.
final Drawable background = getBackground();
if (background == null) {
return;
}
background.getPadding(mBackgroundPadding);
final int maxWidth = background.getIntrinsicWidth() - mBackgroundPadding.left
- mBackgroundPadding.right;
final float width = getTextWidth(text, getPaint());
if (width <= maxWidth) {
sNoScaleXTextSet.add(text);
return;
}
setTextScaleX(maxWidth / width);
}
public static void clearTextCache() {
sNoScaleXTextSet.clear();
}
private static float getTextWidth(final String text, final TextPaint paint) {
if (TextUtils.isEmpty(text)) {
return 0.0f;
}
final int len = text.length();
final float[] widths = new float[len];
final int count = paint.getTextWidths(text, 0, len, widths);
float width = 0;
for (int i = 0; i < count; i++) {
width += widths[i];
}
return width;
}
// Background state set
private static final int[][][] KEY_PREVIEW_BACKGROUND_STATE_TABLE = {
{ // POSITION_MIDDLE
{},
{ R.attr.state_has_morekeys }
},
{ // POSITION_LEFT
{ R.attr.state_left_edge },
{ R.attr.state_left_edge, R.attr.state_has_morekeys }
},
{ // POSITION_RIGHT
{ R.attr.state_right_edge },
{ R.attr.state_right_edge, R.attr.state_has_morekeys }
}
};
private static final int STATE_NORMAL = 0;
private static final int STATE_HAS_MOREKEYS = 1;
public void setPreviewBackground(final boolean hasMoreKeys, final int position) {
final Drawable background = getBackground();
if (background == null) {
return;
}
final int hasMoreKeysState = hasMoreKeys ? STATE_HAS_MOREKEYS : STATE_NORMAL;
background.setState(KEY_PREVIEW_BACKGROUND_STATE_TABLE[position][hasMoreKeysState]);
}
}
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