pulling custom view out so easy to find in project

Author: erchenger

SizeAdjustingTextView.java

@@ -0,0 +1,207 @@
+
+import android.content.Context;
+import android.text.Layout.Alignment;
+import android.text.StaticLayout;
+import android.text.TextPaint;
+import android.util.AttributeSet;
+import android.util.TypedValue;
+import android.widget.TextView;
+
+/**
+ *
+ * SizeAdjustingTextView is a TextView that adjusts text size
+ *  depending if or if not it will fit in the view bounds.
+ * Copyright (C) 2014 Elliott Chenger
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * @author Elliott Chenger
+ * @since Jan 18, 2014
+ * @author Chase Colburn
+ * @since Apr 4, 2011
+ *
+ */
+public class SizeAdjustingTextView extends TextView{
+
+    // Minimum text size for this text view
+    public static final float MIN_TEXT_SIZE = 20;
+
+    // Our ellipse string
+    private static final String mEllipsis = "...";
+
+    // Flag for text and/or size changes to force a resize
+    private boolean mNeedsResize = false;
+
+    // Text size that is set from code. This acts as a starting point for resizing
+    private float mTextSize;
+
+    // Temporary upper bounds on the starting text size
+    private float mMaxTextSize = 0;
+
+    // Lower bounds for text size
+    private float mMinTextSize = MIN_TEXT_SIZE;
+
+    // Text view line spacing multiplier
+    private float mSpacingMult = 1.0f;
+
+    // Text view additional line spacing
+    private float mSpacingAdd = 0.0f;
+
+    // Add ellipsis to text that overflows at the smallest text size
+    private boolean mAddEllipsis = true;
+
+    // Default constructor override
+    public SizeAdjustingTextView(Context context) {
+        this(context, null);
+    }
+
+    // Default constructor when inflating from XML file
+    public SizeAdjustingTextView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    // Default constructor override
+    public SizeAdjustingTextView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        mTextSize = getTextSize();
+    }
+
+    @Override
+    protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
+        mNeedsResize = true;
+        // Since this view may be reused, it is good to reset the text size
+        resetTextSize();
+    }
+
+    @Override
+    public void setText(CharSequence text, BufferType type) {
+        super.setText(text, type);
+        resizeText();
+    }
+
+    @Override
+    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+        if (w != oldw || h != oldh) {
+            mNeedsResize = true;
+        }
+    }
+
+
+    @Override
+    public void setTextSize(float size) {
+        super.setTextSize(size);
+        mTextSize = getTextSize();
+    }
+
+    @Override
+    public void setTextSize(int unit, float size) {
+        super.setTextSize(unit, size);
+        mTextSize = getTextSize();
+    }
+
+    @Override
+    public void setLineSpacing(float add, float mult) {
+        super.setLineSpacing(add, mult);
+        mSpacingMult = mult;
+        mSpacingAdd = add;
+    }
+
+    public void setMaxTextSize(float maxTextSize) {
+        mMaxTextSize = maxTextSize;
+        requestLayout();
+        invalidate();
+    }
+
+    public float getMaxTextSize() {
+        return mMaxTextSize;
+    }
+
+    public void setMinTextSize(float minTextSize) {
+        mMinTextSize = minTextSize;
+        requestLayout();
+        invalidate();
+    }
+
+    public float getMinTextSize() {
+        return mMinTextSize;
+    }
+
+    public void setAddEllipsis(boolean addEllipsis) {
+        mAddEllipsis = addEllipsis;
+    }
+
+    public boolean getAddEllipsis() {
+        return mAddEllipsis;
+    }
+
+    public void resetTextSize() {
+        if(mTextSize > 0) {
+            super.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);
+            mMaxTextSize = mTextSize;
+        }
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        if(changed || mNeedsResize) {
+            int widthLimit = (right - left) - getCompoundPaddingLeft() - getCompoundPaddingRight();
+            int heightLimit = (bottom - top) - getCompoundPaddingBottom() - getCompoundPaddingTop();
+            resizeText(widthLimit, heightLimit);
+        }
+        super.onLayout(changed, left, top, right, bottom);
+    }
+
+
+    public void resizeText() {
+        int heightLimit = getHeight() - getPaddingBottom() - getPaddingTop();
+        int widthLimit = getWidth() - getPaddingLeft() - getPaddingRight();
+        resizeText(widthLimit, heightLimit);
+    }
+
+    public void resizeText(int width, int height) {
+        CharSequence text = getText();
+        if(text == null || text.length() == 0 || height <= 0 || width <= 0 || mTextSize == 0) {
+            return;
+        }
+        float newTextSize = findNewTextSize(width, height, text);
+        changeTextSize(newTextSize);
+        mNeedsResize = false;
+    }
+
+    private void changeTextSize(float newTextSize) {
+        setTextSize(TypedValue.COMPLEX_UNIT_PX,newTextSize);
+        setLineSpacing(mSpacingAdd, mSpacingMult);
+    }
+
+    private float findNewTextSize(int width, int height, CharSequence text) {
+        TextPaint textPaint = new TextPaint(getPaint());
+
+        float targetTextSize = textPaint.getTextSize();
+
+        int textHeight = getTextHeight(text, textPaint, width, targetTextSize);
+        while(textHeight > height && targetTextSize > mMinTextSize) {
+            targetTextSize = Math.max(targetTextSize - 1, mMinTextSize);
+            textHeight = getTextHeight(text, textPaint, width, targetTextSize);
+        }
+        return targetTextSize;
+    }
+
+    private int getTextHeight(CharSequence source, TextPaint paint, int width, float textSize) {
+        paint.setTextSize(textSize);
+        StaticLayout layout = new StaticLayout(source, paint, width, Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, true);
+        return layout.getHeight();
+    }
+
+}