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Merge pull request #22 from arch10/display-enhancement
Display enhancement
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201 changes: 201 additions & 0 deletions
201
app/src/main/java/com/example/arch1/testapplication/CalculatorEditText.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,201 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package com.example.arch1.testapplication; | ||
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| import android.content.Context; | ||
| import android.content.res.TypedArray; | ||
| import android.graphics.Paint; | ||
| import android.graphics.Paint.FontMetricsInt; | ||
| import android.graphics.Rect; | ||
| import android.os.Parcelable; | ||
| import android.text.method.ScrollingMovementMethod; | ||
| import android.text.TextPaint; | ||
| import android.util.AttributeSet; | ||
| import android.util.TypedValue; | ||
| import android.view.ActionMode; | ||
| import android.view.Menu; | ||
| import android.view.MenuItem; | ||
| import android.view.MotionEvent; | ||
| import android.widget.TextView; | ||
| import androidx.appcompat.widget.AppCompatEditText; | ||
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| public class CalculatorEditText extends AppCompatEditText { | ||
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| private final static ActionMode.Callback NO_SELECTION_ACTION_MODE_CALLBACK = | ||
| new ActionMode.Callback() { | ||
| @Override | ||
| public boolean onActionItemClicked(ActionMode mode, MenuItem item) { | ||
| return false; | ||
| } | ||
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| @Override | ||
| public boolean onCreateActionMode(ActionMode mode, Menu menu) { | ||
| // Prevents the selection action mode on double tap. | ||
| return false; | ||
| } | ||
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| @Override | ||
| public void onDestroyActionMode(ActionMode mode) { | ||
| } | ||
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| @Override | ||
| public boolean onPrepareActionMode(ActionMode mode, Menu menu) { | ||
| return false; | ||
| } | ||
| }; | ||
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| private final float mMaximumTextSize; | ||
| private final float mMinimumTextSize; | ||
| private final float mStepTextSize; | ||
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| // Temporary objects for use in layout methods. | ||
| private final Paint mTempPaint = new TextPaint(); | ||
| private final Rect mTempRect = new Rect(); | ||
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| private int mWidthConstraint = -1; | ||
| private OnTextSizeChangeListener mOnTextSizeChangeListener; | ||
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| public CalculatorEditText(Context context) { | ||
| this(context, null); | ||
| } | ||
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| public CalculatorEditText(Context context, AttributeSet attrs) { | ||
| this(context, attrs, 0); | ||
| } | ||
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| public CalculatorEditText(Context context, AttributeSet attrs, int defStyle) { | ||
| super(context, attrs, defStyle); | ||
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| final TypedArray a = context.obtainStyledAttributes( | ||
| attrs, R.styleable.CalculatorEditText, defStyle, 0); | ||
| mMaximumTextSize = a.getDimension( | ||
| R.styleable.CalculatorEditText_maxTextSize, getTextSize()); | ||
| mMinimumTextSize = a.getDimension( | ||
| R.styleable.CalculatorEditText_minTextSize, getTextSize()); | ||
| mStepTextSize = a.getDimension(R.styleable.CalculatorEditText_stepTextSize, | ||
| (mMaximumTextSize - mMinimumTextSize) / 3); | ||
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| a.recycle(); | ||
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| setCustomSelectionActionModeCallback(NO_SELECTION_ACTION_MODE_CALLBACK); | ||
| if (isFocusable()) { | ||
| setMovementMethod(ScrollingMovementMethod.getInstance()); | ||
| } | ||
| setTextSize(TypedValue.COMPLEX_UNIT_PX, mMaximumTextSize); | ||
| setMinHeight(getLineHeight() + getCompoundPaddingBottom() + getCompoundPaddingTop()); | ||
| } | ||
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| @Override | ||
| public boolean onTouchEvent(MotionEvent event) { | ||
| if (event.getActionMasked() == MotionEvent.ACTION_UP) { | ||
| // Hack to prevent keyboard and insertion handle from showing. | ||
| cancelLongPress(); | ||
| } | ||
| return super.onTouchEvent(event); | ||
| } | ||
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| @Override | ||
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { | ||
| super.onMeasure(widthMeasureSpec, heightMeasureSpec); | ||
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| mWidthConstraint = | ||
| MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight(); | ||
| setTextSize(TypedValue.COMPLEX_UNIT_PX, getVariableTextSize(getText().toString())); | ||
| } | ||
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| @Override | ||
| public Parcelable onSaveInstanceState() { | ||
| super.onSaveInstanceState(); | ||
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| // EditText will freeze any text with a selection regardless of getFreezesText() -> | ||
| // return null to prevent any state from being preserved at the instance level. | ||
| return null; | ||
| } | ||
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| @Override | ||
| protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) { | ||
| super.onTextChanged(text, start, lengthBefore, lengthAfter); | ||
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| final int textLength = text.length(); | ||
| if (getSelectionStart() != textLength || getSelectionEnd() != textLength) { | ||
| // Pin the selection to the end of the current text. | ||
| setSelection(textLength); | ||
| } | ||
| setTextSize(TypedValue.COMPLEX_UNIT_PX, getVariableTextSize(text.toString())); | ||
| } | ||
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| @Override | ||
| public void setTextSize(int unit, float size) { | ||
| final float oldTextSize = getTextSize(); | ||
| super.setTextSize(unit, size); | ||
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| if (mOnTextSizeChangeListener != null && getTextSize() != oldTextSize) { | ||
| mOnTextSizeChangeListener.onTextSizeChanged(this, oldTextSize); | ||
| } | ||
| } | ||
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| public void setOnTextSizeChangeListener(OnTextSizeChangeListener listener) { | ||
| mOnTextSizeChangeListener = listener; | ||
| } | ||
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| public float getVariableTextSize(String text) { | ||
| if (mWidthConstraint < 0 || mMaximumTextSize <= mMinimumTextSize) { | ||
| // Not measured, bail early. | ||
| return getTextSize(); | ||
| } | ||
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| // Capture current paint state. | ||
| mTempPaint.set(getPaint()); | ||
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| // 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; | ||
| } | ||
| } | ||
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| return lastFitTextSize; | ||
| } | ||
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| @Override | ||
| public int getCompoundPaddingTop() { | ||
| // Measure the top padding from the capital letter height of the text instead of the top, | ||
| // but don't remove more than the available top padding otherwise clipping may occur. | ||
| getPaint().getTextBounds("H", 0, 1, mTempRect); | ||
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| final FontMetricsInt fontMetrics = getPaint().getFontMetricsInt(); | ||
| final int paddingOffset = -(fontMetrics.ascent + mTempRect.height()); | ||
| return super.getCompoundPaddingTop() - Math.min(getPaddingTop(), paddingOffset); | ||
| } | ||
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| @Override | ||
| public int getCompoundPaddingBottom() { | ||
| // Measure the bottom padding from the baseline of the text instead of the bottom, but don't | ||
| // remove more than the available bottom padding otherwise clipping may occur. | ||
| final FontMetricsInt fontMetrics = getPaint().getFontMetricsInt(); | ||
| return super.getCompoundPaddingBottom() - Math.min(getPaddingBottom(), fontMetrics.descent); | ||
| } | ||
|
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| public interface OnTextSizeChangeListener { | ||
| void onTextSizeChanged(TextView textView, float oldSize); | ||
| } | ||
| } |
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