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78 lines
2.3 KiB
78 lines
2.3 KiB
/*
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* Copyright 2010 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.levien.synthesizer.android.widgets.knob;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.View;
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/**
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* KnobPlaceholderView is an empty widget that behaves the same way as a KnobView when sizing.
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* It's useful for layouts that vary how many knobs they have, but want them sized consistently.
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*/
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public class KnobPlaceholderView extends View {
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public KnobPlaceholderView(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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/**
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* Controls how the knob is sized; it is square, and prefers to be 100x100 pixels.
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*/
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int widthMode = MeasureSpec.getMode(widthMeasureSpec);
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int widthSize = MeasureSpec.getSize(widthMeasureSpec);
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int heightMode = MeasureSpec.getMode(heightMeasureSpec);
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int heightSize = MeasureSpec.getSize(heightMeasureSpec);
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// Prefer 100 for both dimensions.
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int width = 0;
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int height = 0;
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switch (widthMode) {
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case MeasureSpec.EXACTLY:
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width = widthSize;
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break;
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case MeasureSpec.AT_MOST:
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width = widthSize;
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break;
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case MeasureSpec.UNSPECIFIED:
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width = 100;
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break;
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}
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switch (heightMode) {
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case MeasureSpec.EXACTLY:
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height = heightSize;
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break;
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case MeasureSpec.AT_MOST:
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height = heightSize;
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break;
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case MeasureSpec.UNSPECIFIED:
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height = 100;
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break;
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}
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// Make it square.
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if (width > height && widthMode != MeasureSpec.EXACTLY) {
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width = height;
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}
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if (height > width && heightMode != MeasureSpec.EXACTLY) {
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height = width;
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}
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setMeasuredDimension(width, height);
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}
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}
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