/*
* Copyright 2010 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.logging.client;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.HasAllMouseHandlers;
import com.google.gwt.event.dom.client.MouseDownEvent;
import com.google.gwt.event.dom.client.MouseDownHandler;
import com.google.gwt.event.dom.client.MouseMoveEvent;
import com.google.gwt.event.dom.client.MouseMoveHandler;
import com.google.gwt.event.dom.client.MouseUpEvent;
import com.google.gwt.event.dom.client.MouseUpHandler;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
/**
* A simple popup to show log messages, which can be resized, minimized, and
* dragged to a different location.
*/
public class LoggingPopup extends PopupPanel {
/**
* Handles the logic to track click-drag movements with the mouse.
*/
private abstract class MouseDragHandler implements MouseMoveHandler,
MouseUpHandler, MouseDownHandler {
protected boolean dragging = false;
protected Widget dragHandle;
protected int dragStartX;
protected int dragStartY;
public MouseDragHandler(Widget dragHandle) {
this.dragHandle = dragHandle;
HasAllMouseHandlers hamh = (HasAllMouseHandlers) dragHandle;
hamh.addMouseDownHandler(this);
hamh.addMouseUpHandler(this);
hamh.addMouseMoveHandler(this);
}
public abstract void handleDrag(int absX, int absY);
public void onMouseDown(MouseDownEvent event) {
dragging = true;
DOM.setCapture(dragHandle.getElement());
dragStartX = event.getClientX();
dragStartY = event.getClientY();
DOM.eventPreventDefault(DOM.eventGetCurrentEvent());
}
public void onMouseMove(MouseMoveEvent event) {
if (dragging) {
handleDrag(event.getClientX() - dragStartX,
event.getClientY() - dragStartY);
dragStartX = event.getClientX();
dragStartY = event.getClientY();
}
}
public void onMouseUp(MouseUpEvent event) {
dragging = false;
DOM.releaseCapture(dragHandle.getElement());
}
}
private static class ScrollPanelWithMinSize extends ScrollPanel {
private int minScrollPanelHeight = 100;
private int minScrollPanelWidth = 100;
private int scrollPanelHeight;
private int scrollPanelWidth;
public void incrementPixelSize(int width, int height) {
setPixelSize(scrollPanelWidth + width, scrollPanelHeight + height);
}
@Override
public void setPixelSize(int width, int height) {
super.setPixelSize(scrollPanelWidth = Math.max(width, minScrollPanelWidth),
scrollPanelHeight = Math.max(height, minScrollPanelHeight));
}
}
private class WindowMoveHandler extends MouseDragHandler {
public WindowMoveHandler(Widget dragHandle) {
super(dragHandle);
}
@Override
public void handleDrag(int absX, int absY) {
Widget moveTarget = LoggingPopup.this;
RootPanel.get().setWidgetPosition(moveTarget,
moveTarget.getAbsoluteLeft() + absX,
moveTarget.getAbsoluteTop() + absY);
}
}
private class WindowResizeHandler extends MouseDragHandler {
public WindowResizeHandler(Widget dragHandle) {
super(dragHandle);
}
@Override
public void handleDrag(int absX, int absY) {
scrollPanel.incrementPixelSize(absX, absY);
}
}
private final HTML resizeIcon;
private final ScrollPanelWithMinSize scrollPanel;
private VerticalPanel logArea;
public LoggingPopup() {
// Since we don't want to pull UiBinder, or style sheets into the core GWT
// library, styling for this window is done pretty manually.
super(false, false);
VerticalPanel mainPanel = new VerticalPanel();
mainPanel.setBorderWidth(1);
mainPanel.getElement().setAttribute("style", "background-color:white");
final HTML titleBar = new HTML("<center><b>Logging</b></center>");
mainPanel.add(titleBar);
new WindowMoveHandler(titleBar);
scrollPanel = new ScrollPanelWithMinSize();
mainPanel.add(scrollPanel);
logArea = new VerticalPanel();
scrollPanel.setWidget(logArea);
scrollPanel.setPixelSize(300, 200);
HorizontalPanel bottomBar = new HorizontalPanel();
mainPanel.add(bottomBar);
bottomBar.setWidth("100%");
bottomBar.setVerticalAlignment(HasVerticalAlignment.ALIGN_BOTTOM);
final Button maxmin = new Button("Minimize");
bottomBar.add(maxmin);
maxmin.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
if (maxmin.getText().equals("Minimize")) {
maxmin.setText("Maximize");
scrollPanel.setVisible(false);
resizeIcon.setVisible(false);
} else {
scrollPanel.setVisible(true);
resizeIcon.setVisible(true);
maxmin.setText("Minimize");
}
}
});
resizeIcon =
new HTML("<div style='font-size:200%; line-height:75%'>\u21F2</div>");
resizeIcon.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_RIGHT);
bottomBar.add(resizeIcon);
new WindowResizeHandler(resizeIcon);
super.setWidget(mainPanel);
show();
}
@Override
public void add(Widget w) {
logArea.add(w);
}
@Override
public void setWidget(Widget w) {
logArea.clear();
logArea.add(w);
}
}