| /* |
| * 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.Rect; |
| import android.text.Layout; |
| 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 final ActionMode.Callback2 mPasteActionModeCallback = new ActionMode.Callback2() { |
| |
| @Override |
| public boolean onActionItemClicked(ActionMode mode, MenuItem item) { |
| if (item.getItemId() == R.id.menu_paste) { |
| paste(); |
| mode.finish(); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public boolean onCreateActionMode(ActionMode mode, Menu menu) { |
| final ClipboardManager clipboard = (ClipboardManager) getContext() |
| .getSystemService(Context.CLIPBOARD_SERVICE); |
| if (clipboard.hasPrimaryClip()) { |
| bringPointIntoView(length()); |
| MenuInflater inflater = mode.getMenuInflater(); |
| inflater.inflate(R.menu.paste, menu); |
| return true; |
| } |
| // Prevents the selection action mode on double tap. |
| return false; |
| } |
| |
| @Override |
| public boolean onPrepareActionMode(ActionMode mode, Menu menu) { |
| return false; |
| } |
| |
| @Override |
| public void onDestroyActionMode(ActionMode mode) { |
| mActionMode = null; |
| } |
| |
| @Override |
| public void onGetContentRect(ActionMode mode, View view, Rect outRect) { |
| super.onGetContentRect(mode, view, outRect); |
| outRect.top += getTotalPaddingTop(); |
| outRect.right -= getTotalPaddingRight(); |
| outRect.bottom -= getTotalPaddingBottom(); |
| // Encourage menu positioning towards the right, possibly over formula. |
| outRect.left = outRect.right; |
| } |
| }; |
| |
| // Temporary paint for use in layout methods. |
| private final TextPaint mTempPaint = new TextPaint(); |
| |
| private final float mMaximumTextSize; |
| private final float mMinimumTextSize; |
| private final float mStepTextSize; |
| |
| private int mWidthConstraint = -1; |
| |
| private ActionMode mActionMode; |
| |
| private OnPasteListener mOnPasteListener; |
| private OnTextSizeChangeListener mOnTextSizeChangeListener; |
| |
| public CalculatorText(Context context) { |
| this(context, null /* attrs */); |
| } |
| |
| public CalculatorText(Context context, AttributeSet attrs) { |
| this(context, attrs, 0 /* defStyleAttr */); |
| } |
| |
| public CalculatorText(Context context, AttributeSet attrs, int defStyleAttr) { |
| super(context, attrs, defStyleAttr); |
| |
| final TypedArray a = context.obtainStyledAttributes( |
| attrs, R.styleable.CalculatorText, defStyleAttr, 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(); |
| |
| // Allow scrolling by default. |
| setMovementMethod(ScrollingMovementMethod.getInstance()); |
| |
| // Reset the clickable flag, which is added when specifying a movement method. |
| setClickable(false); |
| |
| // Add a long click to start the ActionMode manually. |
| setOnLongClickListener(this); |
| } |
| |
| @Override |
| public boolean onLongClick(View v) { |
| mActionMode = startActionMode(mPasteActionModeCallback, ActionMode.TYPE_FLOATING); |
| return true; |
| } |
| |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| // Re-calculate our textSize based on new width. |
| final int width = MeasureSpec.getSize(widthMeasureSpec) |
| - getPaddingLeft() - getPaddingRight(); |
| if (mWidthConstraint != width) { |
| mWidthConstraint = width; |
| |
| if (!isLaidOut()) { |
| // Prevent shrinking/resizing with our variable textSize. |
| setTextSizeInternal(TypedValue.COMPLEX_UNIT_PX, mMaximumTextSize, |
| false /* notifyListener */); |
| setMinHeight(getLineHeight() + getCompoundPaddingBottom() |
| + getCompoundPaddingTop()); |
| } |
| |
| setTextSizeInternal(TypedValue.COMPLEX_UNIT_PX, getVariableTextSize(getText()), |
| false); |
| } |
| |
| super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| } |
| |
| 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())); |
| } |
| |
| private void setTextSizeInternal(int unit, float size, boolean notifyListener) { |
| final float oldTextSize = getTextSize(); |
| super.setTextSize(unit, size); |
| if (notifyListener && mOnTextSizeChangeListener != null && getTextSize() != oldTextSize) { |
| mOnTextSizeChangeListener.onTextSizeChanged(this, oldTextSize); |
| } |
| } |
| |
| @Override |
| public void setTextSize(int unit, float size) { |
| setTextSizeInternal(unit, size, true); |
| } |
| |
| public float getMinimumTextSize() { |
| return mMinimumTextSize; |
| } |
| |
| public float getMaximumTextSize() { |
| return mMaximumTextSize; |
| } |
| |
| public float getVariableTextSize(CharSequence 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) { |
| mTempPaint.setTextSize(Math.min(lastFitTextSize + mStepTextSize, mMaximumTextSize)); |
| if (Layout.getDesiredWidth(text, mTempPaint) > mWidthConstraint) { |
| break; |
| } |
| lastFitTextSize = mTempPaint.getTextSize(); |
| } |
| |
| return lastFitTextSize; |
| } |
| |
| private static boolean startsWith(CharSequence whole, CharSequence prefix) { |
| int wholeLen = whole.length(); |
| int prefixLen = prefix.length(); |
| if (prefixLen > wholeLen) { |
| return false; |
| } |
| for (int i = 0; i < prefixLen; ++i) { |
| if (prefix.charAt(i) != whole.charAt(i)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Functionally equivalent to setText(), but explicitly announce changes. |
| * If the new text is an extension of the old one, announce the addition. |
| * Otherwise, e.g. after deletion, announce the entire new text. |
| */ |
| public void changeTextTo(CharSequence newText) { |
| final CharSequence oldText = getText(); |
| if (startsWith(newText, oldText)) { |
| final int newLen = newText.length(); |
| final int oldLen = oldText.length(); |
| if (newLen == oldLen + 1) { |
| // The algorithm for pronouncing a single character doesn't seem |
| // to respect our hints. Don't give it the choice. |
| final char c = newText.charAt(oldLen); |
| final int id = KeyMaps.keyForChar(c); |
| final String descr = KeyMaps.toDescriptiveString(getContext(), id); |
| if (descr != null) { |
| announceForAccessibility(descr); |
| } else { |
| announceForAccessibility(String.valueOf(c)); |
| } |
| } else if (newLen > oldLen) { |
| announceForAccessibility(newText.subSequence(oldLen, newLen)); |
| } |
| } else { |
| announceForAccessibility(newText); |
| } |
| setText(newText); |
| } |
| |
| public boolean stopActionMode() { |
| if (mActionMode != null) { |
| mActionMode.finish(); |
| return true; |
| } |
| return false; |
| } |
| |
| public void setOnTextSizeChangeListener(OnTextSizeChangeListener listener) { |
| mOnTextSizeChangeListener = listener; |
| } |
| |
| public void setOnPasteListener(OnPasteListener listener) { |
| mOnPasteListener = listener; |
| } |
| |
| private void paste() { |
| final ClipboardManager clipboard = (ClipboardManager) getContext() |
| .getSystemService(Context.CLIPBOARD_SERVICE); |
| final ClipData primaryClip = clipboard.getPrimaryClip(); |
| if (primaryClip != null && mOnPasteListener != null) { |
| mOnPasteListener.onPaste(primaryClip); |
| } |
| } |
| |
| public interface OnTextSizeChangeListener { |
| void onTextSizeChanged(TextView textView, float oldSize); |
| } |
| |
| public interface OnPasteListener { |
| boolean onPaste(ClipData clip); |
| } |
| } |