/*
* Copyright 2009 Google Inc.
*
* 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.google.gwt.layout.client;
import com.google.gwt.dom.client.Style;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.layout.client.Layout.Layer;
/**
* This implementation is used on IE7 and IE8. Unlike {@link LayoutImpl}, it
* converts all values to pixels before setting them. This is necessary because
* these browsers incorrectly calculate the relative sizes and positions of CSS
* properties specified in certain units (e.g., when the value of an 'em' is
* non-integral in pixels).
*/
public class LayoutImplIE8 extends LayoutImpl {
@Override
public void layout(Layer layer) {
Style style = layer.container.getStyle();
if (layer.setLeft) {
setValue(layer, "left", layer.left, layer.leftUnit, false, false);
} else {
style.clearLeft();
}
if (layer.setRight) {
setValue(layer, "right", layer.right, layer.rightUnit, false, false);
} else {
style.clearRight();
}
if (layer.setTop) {
setValue(layer, "top", layer.top, layer.topUnit, true, false);
} else {
style.clearTop();
}
if (layer.setBottom) {
setValue(layer, "bottom", layer.bottom, layer.bottomUnit, true, false);
} else {
style.clearBottom();
}
if (layer.setWidth) {
setValue(layer, "width", layer.width, layer.widthUnit, false, true);
} else {
style.clearWidth();
}
if (layer.setHeight) {
setValue(layer, "height", layer.height, layer.heightUnit, true, true);
} else {
style.clearHeight();
}
style = layer.child.getStyle();
switch (layer.hPos) {
case BEGIN:
style.setLeft(0, Unit.PX);
style.clearRight();
break;
case END:
style.clearLeft();
style.setRight(0, Unit.PX);
break;
case STRETCH:
style.setLeft(0, Unit.PX);
style.setRight(0, Unit.PX);
break;
}
switch (layer.vPos) {
case BEGIN:
style.setTop(0, Unit.PX);
style.clearBottom();
break;
case END:
style.clearTop();
style.setBottom(0, Unit.PX);
break;
case STRETCH:
style.setTop(0, Unit.PX);
style.setBottom(0, Unit.PX);
break;
}
}
private void setValue(Layer layer, String prop, double value, Unit unit,
boolean vertical, boolean noNegative) {
switch (unit) {
case PX:
case PCT:
// Leave PX and PCT alone. PX doesn't need to be translated, and PCT
// can't be.
break;
default:
value = value
* (int) getUnitSizeInPixels(layer.container, unit, vertical);
unit = Unit.PX;
break;
}
if (noNegative) {
if (value < 0) {
value = 0;
}
}
layer.getContainerElement().getStyle().setProperty(prop, value, unit);
}
}