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/*
* Copyright (C) 2015 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.android.calculator2;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Paint;
import android.net.Uri;
import android.text.TextPaint;
import android.text.method.ScrollingMovementMethod;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
/**
* TextView adapted for Calculator display.
*/
public class CalculatorText extends AlignedTextView implements View.OnLongClickListener {
private ActionMode mActionMode;
private final ActionMode.Callback mPasteActionModeCallback = new ActionMode.Callback() {
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_paste:
pasteContent();
mode.finish();
return true;
default:
return false;
}
}
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
ClipboardManager clipboard =
(ClipboardManager) getContext().getSystemService(
Context.CLIPBOARD_SERVICE);
if (clipboard.hasPrimaryClip()) {
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.paste, menu);
return true;
}
// Prevents the selection action mode on double tap.
return false;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
mActionMode = null;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}
};
private PasteListener mPasteListener;
public void setPasteListener(PasteListener pasteListener) {
mPasteListener = pasteListener;
}
private void pasteContent() {
ClipboardManager clipboard =
(ClipboardManager) getContext().getSystemService(
Context.CLIPBOARD_SERVICE);
ClipData cd = clipboard.getPrimaryClip();
ClipData.Item item = cd.getItemAt(0);
// TODO: Should we handle multiple selections?
Uri uri = item.getUri();
if (uri == null || !mPasteListener.paste(uri)) {
mPasteListener.paste(item.coerceToText(getContext()).toString());
}
}
private final float mMaximumTextSize;
private final float mMinimumTextSize;
private final float mStepTextSize;
// Temporary paint for use in layout methods.
private final Paint mTempPaint = new TextPaint();
private int mWidthConstraint = -1;
private OnTextSizeChangeListener mOnTextSizeChangeListener;
public CalculatorText(Context context) {
this(context, null);
}
public CalculatorText(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CalculatorText(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
final TypedArray a = context.obtainStyledAttributes(
attrs, R.styleable.CalculatorText, defStyle, 0);
mMaximumTextSize = a.getDimension(
R.styleable.CalculatorText_maxTextSize, getTextSize());
mMinimumTextSize = a.getDimension(
R.styleable.CalculatorText_minTextSize, getTextSize());
mStepTextSize = a.getDimension(R.styleable.CalculatorText_stepTextSize,
(mMaximumTextSize - mMinimumTextSize) / 3);
a.recycle();
// Paste ActionMode is triggered explicitly, not through
// setCustomSelectionActionModeCallback.
setOnLongClickListener(this);
// Enable scrolling
setMovementMethod(ScrollingMovementMethod.getInstance());
setTextSize(TypedValue.COMPLEX_UNIT_PX, mMaximumTextSize);
}
@Override
public boolean onLongClick(View v) {
mActionMode = startActionMode(mPasteActionModeCallback, ActionMode.TYPE_FLOATING);
return true;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// Prevent shrinking/resizing with our variable textSize.
if (!isLaidOut()) {
setMinHeight(getLineHeight() + getCompoundPaddingBottom() + getCompoundPaddingTop());
}
mWidthConstraint = MeasureSpec.getSize(widthMeasureSpec)
- getPaddingLeft() - getPaddingRight();
setTextSize(TypedValue.COMPLEX_UNIT_PX, getVariableTextSize(getText().toString()));
}
public int getWidthConstraint() { return mWidthConstraint; }
@Override
protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
super.onTextChanged(text, start, lengthBefore, lengthAfter);
setTextSize(TypedValue.COMPLEX_UNIT_PX, getVariableTextSize(text.toString()));
}
@Override
public void setTextSize(int unit, float size) {
final float oldTextSize = getTextSize();
super.setTextSize(unit, size);
if (mOnTextSizeChangeListener != null && getTextSize() != oldTextSize) {
mOnTextSizeChangeListener.onTextSizeChanged(this, oldTextSize);
}
}
public void setOnTextSizeChangeListener(OnTextSizeChangeListener listener) {
mOnTextSizeChangeListener = listener;
}
public float getMinimumTextSize() {
return mMinimumTextSize;
}
public float getMaximumTextSize() {
return mMaximumTextSize;
}
public float getVariableTextSize(String text) {
if (mWidthConstraint < 0 || mMaximumTextSize <= mMinimumTextSize) {
// Not measured, bail early.
return getTextSize();
}
// Capture current paint state.
mTempPaint.set(getPaint());
// Step through increasing text sizes until the text would no longer fit.
float lastFitTextSize = mMinimumTextSize;
while (lastFitTextSize < mMaximumTextSize) {
final float nextSize = Math.min(lastFitTextSize + mStepTextSize, mMaximumTextSize);
mTempPaint.setTextSize(nextSize);
if (mTempPaint.measureText(text) > mWidthConstraint) {
break;
} else {
lastFitTextSize = nextSize;
}
}
return lastFitTextSize;
}
public boolean stopActionMode() {
if (mActionMode != null) {
mActionMode.finish();
return true;
}
return false;
}
public interface OnTextSizeChangeListener {
void onTextSizeChanged(TextView textView, float oldSize);
}
public interface PasteListener {
void paste(String s);
boolean paste(Uri u);
}
}
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