85 lines
2.9 KiB
Java
85 lines
2.9 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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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.android.inputmethod.keyboard.internal;
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import android.graphics.Canvas;
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import android.view.View;
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import com.android.inputmethod.keyboard.MainKeyboardView;
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import com.android.inputmethod.keyboard.PointerTracker;
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import javax.annotation.Nonnull;
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/**
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* Abstract base class for previews that are drawn on DrawingPreviewPlacerView, e.g.,
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* GestureFloatingTextDrawingPreview, GestureTrailsDrawingPreview, and
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* SlidingKeyInputDrawingPreview.
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*/
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public abstract class AbstractDrawingPreview {
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private View mDrawingView;
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private boolean mPreviewEnabled;
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private boolean mHasValidGeometry;
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public void setDrawingView(@Nonnull final DrawingPreviewPlacerView drawingView) {
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mDrawingView = drawingView;
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drawingView.addPreview(this);
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}
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protected void invalidateDrawingView() {
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if (mDrawingView != null) {
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mDrawingView.invalidate();
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}
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}
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protected final boolean isPreviewEnabled() {
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return mPreviewEnabled && mHasValidGeometry;
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}
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public final void setPreviewEnabled(final boolean enabled) {
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mPreviewEnabled = enabled;
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}
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/**
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* Set {@link MainKeyboardView} geometry and position in the window of input method.
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* The class that is overriding this method must call this super implementation.
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*
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* @param originCoords the top-left coordinates of the {@link MainKeyboardView} in
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* the input method window coordinate-system. This is unused but has a point in an
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* extended class, such as {@link GestureTrailsDrawingPreview}.
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* @param width the width of {@link MainKeyboardView}.
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* @param height the height of {@link MainKeyboardView}.
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*/
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public void setKeyboardViewGeometry(@Nonnull final int[] originCoords, final int width,
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final int height) {
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mHasValidGeometry = (width > 0 && height > 0);
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}
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public abstract void onDeallocateMemory();
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/**
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* Draws the preview
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* @param canvas The canvas where the preview is drawn.
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*/
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public abstract void drawPreview(@Nonnull final Canvas canvas);
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/**
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* Set the position of the preview.
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* @param tracker The new location of the preview is based on the points in PointerTracker.
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*/
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public abstract void setPreviewPosition(@Nonnull final PointerTracker tracker);
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}
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