content: /*
   * 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 com.amnesica.kryptey.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 com.amnesica.kryptey.inputmethod.keyboard.Key;
  
  import java.util.HashSet;
  
  /**
   * The pop up key preview view.
   */
  public class KeyPreviewView extends TextView {
    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;
    }
  
      /*public void setPreviewBackground(boolean customColorEnabled, int customColor) {
          final Drawable background = getBackground();
          if (customColorEnabled)
              background.setColorFilter(customColor, PorterDuff.Mode.OVERLAY);
      }*/
  }
  