451 lines
14 KiB
Java
451 lines
14 KiB
Java
/**
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* Copyright (c) 2012 Wireless Designs, LLC
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* <p>
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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* <p>
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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* <p>
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package org.mariotaku.twidere.graphic;
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import android.content.Context;
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import android.content.res.ColorStateList;
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import android.content.res.Resources;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.ColorFilter;
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import android.graphics.Paint;
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import android.graphics.Path;
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import android.graphics.PixelFormat;
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import android.graphics.Rect;
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import android.graphics.Typeface;
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import android.graphics.drawable.Drawable;
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import android.support.annotation.NonNull;
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import android.text.Layout;
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import android.text.StaticLayout;
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import android.text.TextPaint;
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import android.util.TypedValue;
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/**
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* A Drawable object that draws text. A TextDrawable accepts most of the same
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* parameters that can be applied to {@link android.widget.TextView} for
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* displaying and formatting text.
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*
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* Optionally, a {@link Path} may be supplied on which to draw the text.
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*
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* A TextDrawable has an intrinsic size equal to that required to draw all the
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* text it has been supplied, when possible. In cases where a {@link Path} has
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* been supplied, the caller must explicitly call
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* {@link #setBounds(android.graphics.Rect) setBounds()} to provide the Drawable
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* size based on the Path constraints.
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*/
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public class TextDrawable extends Drawable {
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/* Platform XML constants for typeface */
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private static final int SANS = 1;
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private static final int SERIF = 2;
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private static final int MONOSPACE = 3;
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/* Resources for scaling values to the given device */
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private final Resources mResources;
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/* Paint to hold most drawing primitives for the text */
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private final TextPaint mTextPaint;
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/* Layout is used to measure and draw the text */
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private StaticLayout mTextLayout;
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/* Alignment of the text inside its bounds */
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private Layout.Alignment mTextAlignment = Layout.Alignment.ALIGN_NORMAL;
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/* Optional path on which to draw the text */
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private Path mTextPath;
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/* Stateful text color list */
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private ColorStateList mTextColors;
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/* Container for the bounds to be reported to widgets */
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private final Rect mTextBounds;
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/* Text string to draw */
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private CharSequence mText = "";
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/* Attribute lists to pull default values from the current theme */
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private static final int[] themeAttributes = {android.R.attr.textAppearance};
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private static final int[] appearanceAttributes = {android.R.attr.textSize, android.R.attr.typeface,
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android.R.attr.textStyle, android.R.attr.textColor};
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public TextDrawable(final Context context) {
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super();
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// Used to load and scale resource items
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mResources = context.getResources();
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// Definition of this drawables size
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mTextBounds = new Rect();
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// Paint to use for the text
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mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
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mTextPaint.density = mResources.getDisplayMetrics().density;
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mTextPaint.setDither(true);
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int textSize = 15;
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ColorStateList textColor = null;
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int styleIndex = -1;
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int typefaceIndex = -1;
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// Set default parameters from the current theme
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final TypedArray a = context.getTheme().obtainStyledAttributes(themeAttributes);
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final int appearanceId = a.getResourceId(0, -1);
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a.recycle();
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TypedArray ap = null;
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if (appearanceId != -1) {
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ap = context.obtainStyledAttributes(appearanceId, appearanceAttributes);
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}
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if (ap != null) {
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for (int i = 0; i < ap.getIndexCount(); i++) {
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final int attr = ap.getIndex(i);
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switch (attr) {
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case 0: // Text Size
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textSize = a.getDimensionPixelSize(attr, textSize);
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break;
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case 1: // Typeface
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typefaceIndex = a.getInt(attr, typefaceIndex);
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break;
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case 2: // Text Style
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styleIndex = a.getInt(attr, styleIndex);
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break;
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case 3: // Text Color
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textColor = a.getColorStateList(attr);
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break;
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default:
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break;
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}
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}
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ap.recycle();
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}
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setTextColor(textColor != null ? textColor : ColorStateList.valueOf(0xFF000000));
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setRawTextSize(textSize);
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Typeface tf = null;
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switch (typefaceIndex) {
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case SANS:
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tf = Typeface.SANS_SERIF;
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break;
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case SERIF:
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tf = Typeface.SERIF;
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break;
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case MONOSPACE:
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tf = Typeface.MONOSPACE;
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break;
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}
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setTypeface(tf, styleIndex);
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}
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@Override
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public void draw(@NonNull final Canvas canvas) {
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if (mTextPath == null) {
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// Allow the layout to draw the text
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mTextLayout.draw(canvas);
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} else {
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// Draw directly on the canvas using the supplied path
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canvas.drawTextOnPath(mText.toString(), mTextPath, 0, 0, mTextPaint);
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}
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}
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@Override
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public int getIntrinsicHeight() {
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// Return the vertical bounds measured, or -1 if none
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if (mTextBounds.isEmpty())
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return -1;
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else
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return mTextBounds.bottom - mTextBounds.top;
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}
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@Override
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public int getIntrinsicWidth() {
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// Return the horizontal bounds measured, or -1 if none
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if (mTextBounds.isEmpty())
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return -1;
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else
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return mTextBounds.right - mTextBounds.left;
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}
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@Override
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public int getOpacity() {
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return PixelFormat.TRANSLUCENT;
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}
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/**
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* Return the text currently being displayed
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*/
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public CharSequence getText() {
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return mText;
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}
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/**
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* Return the current text alignment setting
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*/
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public Layout.Alignment getTextAlign() {
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return mTextAlignment;
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}
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/**
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* Return the horizontal stretch factor of the text
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*/
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public float getTextScaleX() {
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return mTextPaint.getTextScaleX();
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}
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/**
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* Return the current text size, in pixels
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*/
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public float getTextSize() {
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return mTextPaint.getTextSize();
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}
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/**
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* Return the current typeface and style that the Paint using for display.
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*/
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public Typeface getTypeface() {
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return mTextPaint.getTypeface();
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}
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@Override
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public boolean isStateful() {
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/*
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* The drawable's ability to represent state is based on the text color
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* list set
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*/
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return mTextColors.isStateful();
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}
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@Override
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public void setAlpha(final int alpha) {
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if (mTextPaint.getAlpha() != alpha) {
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mTextPaint.setAlpha(alpha);
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}
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}
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@Override
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public void setColorFilter(final ColorFilter cf) {
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if (mTextPaint.getColorFilter() != cf) {
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mTextPaint.setColorFilter(cf);
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}
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}
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/**
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* Set the text that will be displayed
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*
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* @param text Text to display
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*/
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public void setText(CharSequence text) {
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if (text == null) {
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text = "";
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}
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mText = text;
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measureContent();
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}
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/**
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* Set the text alignment. The alignment itself is based on the text layout
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* direction. For LTR text NORMAL is left aligned and OPPOSITE is right
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* aligned. For RTL text, those alignments are reversed.
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*
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* @param align Text alignment value. Should be set to one of:
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*
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* {@link Layout.Alignment#ALIGN_NORMAL},
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* {@link Layout.Alignment#ALIGN_NORMAL},
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* {@link Layout.Alignment#ALIGN_OPPOSITE}.
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*/
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public void setTextAlign(final Layout.Alignment align) {
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if (mTextAlignment != align) {
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mTextAlignment = align;
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measureContent();
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}
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}
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/**
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* Set the text color as a state list
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*
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* @param colorStateList ColorStateList of text colors, such as inflated
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* from an R.color resource
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*/
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public void setTextColor(final ColorStateList colorStateList) {
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mTextColors = colorStateList;
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updateTextColors(getState());
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}
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/**
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* Set a single text color for all states
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*
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* @param color Color value such as {@link Color#WHITE} or
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* {@link Color#argb(int, int, int, int)}
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*/
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public void setTextColor(final int color) {
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setTextColor(ColorStateList.valueOf(color));
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}
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/**
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* Optional Path object on which to draw the text. If this is set,
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* TextDrawable cannot properly measure the bounds this drawable will need.
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* You must call {@link #setBounds(int, int, int, int) setBounds()} before
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* applying this TextDrawable to any View.
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*
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* Calling this method with <code>null</code> will remove any Path currently
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* attached.
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*/
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public void setTextPath(final Path path) {
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if (mTextPath != path) {
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mTextPath = path;
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measureContent();
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}
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}
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/**
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* Set the horizontal stretch factor of the text
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*
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* @param size Text scale factor
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*/
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public void setTextScaleX(final float size) {
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if (size != mTextPaint.getTextScaleX()) {
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mTextPaint.setTextScaleX(size);
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measureContent();
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}
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}
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/**
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* Set the text size. The value will be interpreted in "sp" units
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*
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* @param size Text size value, in sp
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*/
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public void setTextSize(final float size) {
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setTextSize(TypedValue.COMPLEX_UNIT_SP, size);
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}
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/**
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* Set the text size, using the supplied complex units
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*
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* @param unit Units for the text size, such as dp or sp
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* @param size Text size value
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*/
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public void setTextSize(final int unit, final float size) {
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final float dimension = TypedValue.applyDimension(unit, size, mResources.getDisplayMetrics());
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setRawTextSize(dimension);
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}
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/**
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* Sets the typeface and style in which the text should be displayed. Note
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* that not all Typeface families actually have bold and italic variants, so
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* you may need to use {@link #setTypeface(Typeface, int)} to get the
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* appearance that you actually want.
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*/
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public void setTypeface(final Typeface tf) {
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if (mTextPaint.getTypeface() != tf) {
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mTextPaint.setTypeface(tf);
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measureContent();
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}
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}
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/**
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* Sets the typeface and style in which the text should be displayed, and
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* turns on the fake bold and italic bits in the Paint if the Typeface that
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* you provided does not have all the bits in the style that you specified.
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*
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*/
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public void setTypeface(Typeface tf, final int style) {
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if (style > 0) {
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if (tf == null) {
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tf = Typeface.defaultFromStyle(style);
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} else {
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tf = Typeface.create(tf, style);
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}
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setTypeface(tf);
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// now compute what (if any) algorithmic styling is needed
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final int typefaceStyle = tf != null ? tf.getStyle() : 0;
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final int need = style & ~typefaceStyle;
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mTextPaint.setFakeBoldText((need & Typeface.BOLD) != 0);
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mTextPaint.setTextSkewX((need & Typeface.ITALIC) != 0 ? -0.25f : 0);
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} else {
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mTextPaint.setFakeBoldText(false);
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mTextPaint.setTextSkewX(0);
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setTypeface(tf);
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}
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}
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@Override
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protected void onBoundsChange(final Rect bounds) {
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// Update the internal bounds in response to any external requests
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mTextBounds.set(bounds);
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}
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@Override
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protected boolean onStateChange(final int[] state) {
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// Upon state changes, grab the correct text color
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return updateTextColors(state);
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}
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/**
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* Internal method to take measurements of the current contents and apply
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* the correct bounds when possible.
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*/
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private void measureContent() {
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// If drawing to a path, we cannot measure intrinsic bounds
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// We must resly on setBounds being called externally
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if (mTextPath != null) {
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// Clear any previous measurement
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mTextLayout = null;
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mTextBounds.setEmpty();
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} else {
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// Measure text bounds
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final float desired = Layout.getDesiredWidth(mText, mTextPaint);
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mTextLayout = new StaticLayout(mText, mTextPaint, (int) desired, mTextAlignment, 1.0f, 0.0f, false);
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mTextBounds.set(0, 0, mTextLayout.getWidth(), mTextLayout.getHeight());
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}
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// We may need to be redrawn
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invalidateSelf();
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}
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/*
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* Set the text size, in raw pixels
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*/
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private void setRawTextSize(final float size) {
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if (size != mTextPaint.getTextSize()) {
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mTextPaint.setTextSize(size);
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measureContent();
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}
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}
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/**
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* Internal method to apply the correct text color based on the drawable's
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* state
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*/
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private boolean updateTextColors(final int[] stateSet) {
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final int newColor = mTextColors.getColorForState(stateSet, Color.WHITE);
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if (mTextPaint.getColor() != newColor) {
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mTextPaint.setColor(newColor);
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return true;
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}
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return false;
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}
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} |