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Diffstat (limited to 'src/com/android/camera/OnScreenHint.java')
| -rw-r--r-- | src/com/android/camera/OnScreenHint.java | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/com/android/camera/OnScreenHint.java b/src/com/android/camera/OnScreenHint.java new file mode 100644 index 000000000..4d7fa7088 --- /dev/null +++ b/src/com/android/camera/OnScreenHint.java @@ -0,0 +1,190 @@ +/* + * Copyright (C) 2009 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.camera; + +import android.content.Context; +import android.graphics.PixelFormat; +import android.os.Handler; +import android.view.Gravity; +import android.view.LayoutInflater; +import android.view.View; +import android.view.WindowManager; +import android.widget.TextView; + +import com.android.gallery3d.R; + +/** + * A on-screen hint is a view containing a little message for the user and will + * be shown on the screen continuously. This class helps you create and show + * those. + * + * <p> + * When the view is shown to the user, appears as a floating view over the + * application. + * <p> + * The easiest way to use this class is to call one of the static methods that + * constructs everything you need and returns a new {@code OnScreenHint} object. + */ +public class OnScreenHint { + static final String TAG = "OnScreenHint"; + + int mGravity = Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM; + int mX, mY; + float mHorizontalMargin; + float mVerticalMargin; + View mView; + View mNextView; + + private final WindowManager.LayoutParams mParams = + new WindowManager.LayoutParams(); + private final WindowManager mWM; + private final Handler mHandler = new Handler(); + + /** + * Construct an empty OnScreenHint object. + * + * @param context The context to use. Usually your + * {@link android.app.Application} or + * {@link android.app.Activity} object. + */ + private OnScreenHint(Context context) { + mWM = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); + mY = context.getResources().getDimensionPixelSize( + R.dimen.hint_y_offset); + + mParams.height = WindowManager.LayoutParams.WRAP_CONTENT; + mParams.width = WindowManager.LayoutParams.WRAP_CONTENT; + mParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE + | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE; + mParams.format = PixelFormat.TRANSLUCENT; + mParams.windowAnimations = R.style.Animation_OnScreenHint; + mParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_PANEL; + mParams.setTitle("OnScreenHint"); + } + + /** + * Show the view on the screen. + */ + public void show() { + if (mNextView == null) { + throw new RuntimeException("View is not initialized"); + } + mHandler.post(mShow); + } + + /** + * Close the view if it's showing. + */ + public void cancel() { + mHandler.post(mHide); + } + + /** + * Make a standard hint that just contains a text view. + * + * @param context The context to use. Usually your + * {@link android.app.Application} or + * {@link android.app.Activity} object. + * @param text The text to show. Can be formatted text. + * + */ + public static OnScreenHint makeText(Context context, CharSequence text) { + OnScreenHint result = new OnScreenHint(context); + + LayoutInflater inflate = + (LayoutInflater) context.getSystemService( + Context.LAYOUT_INFLATER_SERVICE); + View v = inflate.inflate(R.layout.on_screen_hint, null); + TextView tv = (TextView) v.findViewById(R.id.message); + tv.setText(text); + + result.mNextView = v; + + return result; + } + + /** + * Update the text in a OnScreenHint that was previously created using one + * of the makeText() methods. + * @param s The new text for the OnScreenHint. + */ + public void setText(CharSequence s) { + if (mNextView == null) { + throw new RuntimeException("This OnScreenHint was not " + + "created with OnScreenHint.makeText()"); + } + TextView tv = (TextView) mNextView.findViewById(R.id.message); + if (tv == null) { + throw new RuntimeException("This OnScreenHint was not " + + "created with OnScreenHint.makeText()"); + } + tv.setText(s); + } + + private synchronized void handleShow() { + if (mView != mNextView) { + // remove the old view if necessary + handleHide(); + mView = mNextView; + final int gravity = mGravity; + mParams.gravity = gravity; + if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) + == Gravity.FILL_HORIZONTAL) { + mParams.horizontalWeight = 1.0f; + } + if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) + == Gravity.FILL_VERTICAL) { + mParams.verticalWeight = 1.0f; + } + mParams.x = mX; + mParams.y = mY; + mParams.verticalMargin = mVerticalMargin; + mParams.horizontalMargin = mHorizontalMargin; + if (mView.getParent() != null) { + mWM.removeView(mView); + } + mWM.addView(mView, mParams); + } + } + + private synchronized void handleHide() { + if (mView != null) { + // note: checking parent() just to make sure the view has + // been added... i have seen cases where we get here when + // the view isn't yet added, so let's try not to crash. + if (mView.getParent() != null) { + mWM.removeView(mView); + } + mView = null; + } + } + + private final Runnable mShow = new Runnable() { + @Override + public void run() { + handleShow(); + } + }; + + private final Runnable mHide = new Runnable() { + @Override + public void run() { + handleHide(); + } + }; +} + |