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/*
* 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 android.webkit;
import android.view.View;
class ZoomManager {
static final String LOGTAG = "webviewZoom";
private final WebView mWebView;
// manages the on-screen zoom functions of the WebView
private ZoomControlEmbedded mEmbeddedZoomControl;
private ZoomControlExternal mExternalZoomControl;
/*
* TODO: clean up the visibility of the class variables when the zoom
* refactoring is complete
*/
// default scale limits, which are dependent on the display density
static float DEFAULT_MAX_ZOOM_SCALE;
static float DEFAULT_MIN_ZOOM_SCALE;
// actual scale limits, which can be set through a webpage viewport meta tag
float mMaxZoomScale;
float mMinZoomScale;
// locks the minimum ZoomScale to the value currently set in mMinZoomScale
boolean mMinZoomScaleFixed = true;
// while in the zoom overview mode, the page's width is fully fit to the
// current window. The page is alive, in another words, you can click to
// follow the links. Double tap will toggle between zoom overview mode and
// the last zoom scale.
boolean mInZoomOverview = false;
public ZoomManager(WebView webView) {
mWebView = webView;
}
public void init(float density) {
DEFAULT_MAX_ZOOM_SCALE = 4.0f * density;
DEFAULT_MIN_ZOOM_SCALE = 0.25f * density;
mMaxZoomScale = DEFAULT_MAX_ZOOM_SCALE;
mMinZoomScale = DEFAULT_MIN_ZOOM_SCALE;
}
private ZoomControlBase getCurrentZoomControl() {
if (mWebView.getSettings() != null && mWebView.getSettings().supportZoom()) {
if (mWebView.getSettings().getBuiltInZoomControls()) {
if (mEmbeddedZoomControl == null) {
mEmbeddedZoomControl = new ZoomControlEmbedded(this, mWebView);
}
return mEmbeddedZoomControl;
} else {
if (mExternalZoomControl == null) {
mExternalZoomControl = new ZoomControlExternal(mWebView);
}
return mExternalZoomControl;
}
}
return null;
}
public void invokeZoomPicker() {
ZoomControlBase control = getCurrentZoomControl();
if (control != null) {
control.show();
}
}
public void dismissZoomPicker() {
ZoomControlBase control = getCurrentZoomControl();
if (control != null) {
control.hide();
}
}
public boolean isZoomPickerVisible() {
ZoomControlBase control = getCurrentZoomControl();
return (control != null) ? control.isVisible() : false;
}
public void updateZoomPicker() {
ZoomControlBase control = getCurrentZoomControl();
if (control != null) {
control.update();
}
}
/**
* The embedded zoom control intercepts touch events and automatically stays
* visible. The external control needs to constantly refresh its internal
* timer to stay visible.
*/
public void keepZoomPickerVisible() {
ZoomControlBase control = getCurrentZoomControl();
if (control != null && control == mExternalZoomControl) {
control.show();
}
}
public View getExternalZoomPicker() {
ZoomControlBase control = getCurrentZoomControl();
if (control != null && control == mExternalZoomControl) {
return mExternalZoomControl.getControls();
} else {
return null;
}
}
}
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