/* * Copyright (C) 2010 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.calendar; import android.content.Context; import android.graphics.Canvas; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.util.Log; import android.view.Gravity; import android.widget.Button; /** *

* A button with more than two states. When the button is pressed * or clicked, the state transitions automatically. *

* *

XML attributes

*

* See {@link R.styleable#MultiStateButton * MultiStateButton Attributes}, {@link android.R.styleable#Button Button * Attributes}, {@link android.R.styleable#TextView TextView Attributes}, {@link * android.R.styleable#View View Attributes} *

*/ public class MultiStateButton extends Button { //The current state for this button, ranging from 0 to maxState-1 private int mState; //The maximum number of states allowed for this button. private int mMaxStates; //The currently displaying resource ID. This gets set to a default on creation and remains //on the last set if the resources get set to null. private int mButtonResource; //A list of all drawable resources used by this button in the order it uses them. private int[] mButtonResources; private Drawable mButtonDrawable; public MultiStateButton(Context context) { this(context, null); } public MultiStateButton(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MultiStateButton(Context context, AttributeSet attrs, int defStyle) { //Currently using the standard buttonStyle, will update when new resources are added. super(context, attrs, defStyle); mMaxStates = 1; mState = 0; //TODO add a more generic default button mButtonResources = new int[] { R.drawable.widget_show }; setButtonDrawable(mButtonResources[mState]); } @Override public boolean performClick() { /* When clicked, toggle the state */ transitionState(); return super.performClick(); } public void transitionState() { mState = (mState + 1) % mMaxStates; setButtonDrawable(mButtonResources[mState]); } /** * Allows for a new set of drawable resource ids to be set. * * This sets the maximum states allowed to the length of the resources array. It will also * set the current state to the maximum allowed if it's greater than the new max. */ public void setButtonResources(int[] resources) throws IllegalArgumentException { if(resources == null) { throw new IllegalArgumentException("Button resources cannot be null"); } mMaxStates = resources.length; if(mState >= mMaxStates) { mState = mMaxStates - 1; } mButtonResources = resources; } /** * Attempts to set the state. Returns true if successful, false otherwise. */ public boolean setState(int state){ if(state >= mMaxStates || state < 0) { //When moved out of Calendar the tag should be changed. Log.w("Cal", "MultiStateButton state set to value greater than maxState or < 0"); return false; } mState = state; setButtonDrawable(mButtonResources[mState]); return true; } public int getState() { return mState; } /** * Set the background to a given Drawable, identified by its resource id. * * @param resid the resource id of the drawable to use as the background */ public void setButtonDrawable(int resid) { if (resid != 0 && resid == mButtonResource) { return; } mButtonResource = resid; Drawable d = null; if (mButtonResource != 0) { d = getResources().getDrawable(mButtonResource); } setButtonDrawable(d); } /** * Set the background to a given Drawable * * @param d The Drawable to use as the background */ public void setButtonDrawable(Drawable d) { if (d != null) { if (mButtonDrawable != null) { mButtonDrawable.setCallback(null); unscheduleDrawable(mButtonDrawable); } d.setCallback(this); d.setState(getDrawableState()); d.setVisible(getVisibility() == VISIBLE, false); mButtonDrawable = d; mButtonDrawable.setState(null); setMinHeight(mButtonDrawable.getIntrinsicHeight()); setWidth(mButtonDrawable.getIntrinsicWidth()); } refreshDrawableState(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (mButtonDrawable != null) { final int verticalGravity = getGravity() & Gravity.VERTICAL_GRAVITY_MASK; final int horizontalGravity = getGravity() & Gravity.HORIZONTAL_GRAVITY_MASK; final int height = mButtonDrawable.getIntrinsicHeight(); final int width = mButtonDrawable.getIntrinsicWidth(); int y = 0; int x = 0; switch (verticalGravity) { case Gravity.BOTTOM: y = getHeight() - height; break; case Gravity.CENTER_VERTICAL: y = (getHeight() - height) / 2; break; } switch (horizontalGravity) { case Gravity.RIGHT: x = getWidth() - width; break; case Gravity.CENTER_HORIZONTAL: x = (getWidth() - width) / 2; break; } mButtonDrawable.setBounds(x, y, x + width, y + height); mButtonDrawable.draw(canvas); } } }