I'm working on a SWT/Jface project based on Java SE, i want to move the image of a TitleAreaDialog to the left. is it possible ? if not is there anyway ?
Thanks,
There is no way to configure it using API, the layout is hard-coded. One way is to hack into the dialog controls and change their layout data, but it is likely easier to implement your own class (using TitleAreaDialog as an example).
If you subclass TitleAreaDialog you have to override createContents(Composite) method, otherwise the TitleAreaDialog will create its own title area by calling createTitleArea(). I suggest that at first you just copy the code from TitleAreaDialog.createContents() and start replacing stuff that you need to be done differently. I don't know exactly what needs to be done without actually doing everything.
You can modify the layout data of the image label as follows:
TitleAreaDialog tad = new TitleAreaDialog(getShell()) {
#Override
protected Control createContents(Composite parent) {
Control control = super.createContents(parent);
Label label = getTitleImageLabel();
FormData data = (FormData) label.getLayoutData();
data.left = new FormAttachment(0, 0);
data.right = null;
return control;
}
};
tad.setTitle("title");
tad.setTitleImage(Activator.imageDescriptorFromPlugin(
Activator.PLUGIN_ID, "image.gif").createImage());
tad.open();
Related
I'm trying to build a dynamic web app in GWT, when widgets are added to the screen I remember their 'name' by setting the Widget.setId, when I want to replace part of the page, I can find the element in question via DOM.getElementById('name'), and its parent using DOM.getParentElement(), and then remove its children.
Now I have a com.google.gwt.dom.client.Element object (the parent). What I want to do is turn this back into a GWT object - in fact it'll be something derived from Panel, so I can add additional Widgets.
How do I go from the Element object back to a Panel object ?
I totally accept I could be going about this the wrong way, in which case is there a better way?
I think your approach to remove widgets from the DOM using DOM.getElementById('name') is not the proper one.
On your case (I am just figuring out what you do), I would keep Java Objects references instead of accessing to them using the DOM.
For instance:
HorizontalPanel panel = new HorizontalPanel();
Widget w = new Widget();
//We add the one widget to the panel
panel.add(w);
//One more widget added
w = new Widget();
panel.add(w);
//Now we remove all the widgets from the panel
for(int i = 0; i < panel.getWidgetCount(); i++){
panel.remove(panel.getWidget(i));
}
UPDATE
Based on your comments, I would propose the following solution.
I suppose that you are storing widgets on HorizontalPanel, just apply this solution to your concrete case.
I propose to use customized class which inherits from HorizontalPanel and add a Map there to store relationship between names and widgets.
public class MyHorizontalPanel extends HorizontalPanel {
private Map<String, Widget> widgetsMap;
public MyHorizontalPanel(){
super();
widgetsMap = new HashMap<String, Widget>();
}
//We use Map to store the relationship between widget and name
public void aadWidget(Widget w, String name){
this.add(w);
widgetsMap.put(name, w);
}
//When we want to delete and just have the name, we can search the key on the map.
//It is important to remove all references to the widget (panel and map)
public void removeWidget(String name){
this.remove(widgetsMap.get(name));
widgetsMap.remove(name);
}
}
I have a JList that is displaying a custom object (Frog) using a custom cell renderer.
frogList = new JList<Frog>();
frogModel = new DefaultListModel<Frog>();
frogList.setModel(frogModel);
frogList.setCellRenderer(new FrogBrowserCellRenderer());
//add frogs...
The frog objects contains a list of images, and I have my list pick the latest one to display. It's in a thumbnail file, so I can read it into memory and display it. However I know that the JList re-renders every time the window moves or the window needs redrawn which is really bad for performance and just not good design. The issue I have is that this list is dynamic so I cannot simply load all images at startup because users can add them at runtime and it'll auto update the list.
Some people mentioned loading the image into memory in the constructor and setting it in the getListCellRendererComponent() method but that doesn't appear to be possible because it only creates one cell renderer and uses it for everything in the list. I also verified this by printing out the constructor method. Since I will have a list of frogs with all different images this doesn't really make sense.
Here is the code I am using to create the thumbnail right now.
public Image createListThumbnail() {
try {
Image returnImg = null;
//get latest frog image
SiteImage img = frog.getLatestImage();
BufferedImage src = ImageIO.read(new File(XMLFrogDatabase.getImagesFolder()+img.getImageFileName()));
BufferedImage thumbnail = Scalr.resize(src, Scalr.Method.SPEED, Scalr.Mode.FIT_TO_WIDTH, 200, 150, Scalr.OP_ANTIALIAS);
if (!frog.isFullySearchable()){
ImageFilter filter = new GrayFilter(true, 30);
ImageProducer producer = new FilteredImageSource(thumbnail.getSource(), filter);
returnImg = Toolkit.getDefaultToolkit().createImage(producer);
}
return returnImg;
} catch (IOException e) {
IdentiFrog.LOGGER.writeExceptionWithMessage("Unable to generate thumbnail for image (in memory).", e);
}
return null;
}
I call this method in my getListCellRendererComponent() which I know causes terrible performance but I don't understand how to cache it in memory for multiple frogs and also use only one object. Perhaps an image map? I can't seem to find any solid evidence of a proper way to do this.
I'm having troubles making a second call to load a Google Map in a GWT app. The problem itself is that once the map is called, it won't fit the container size. This is a usual problem, as depicted in many previous SO questions:
Here
Here
Here
Here
Let me state that I've tried all of the above and sadly nothing seems to work. I must also say I'm using the unofficial version of GWT Maps API v3, which can be found here. Thus, this is the problem:
Now, weird enough, if I change the browser size, map displays correctly:
Thus, it looks like I need to "dispatch" the onResize event somehow...but I tried with all of the above methods and nothing seemed to work. Just for clarification this, is the part where I construct the map and add it to the container:
private void buildMapMarinesPark() {
//Visualizar datos...
LatLng center = LatLng.newInstance(52.62715,1.7734);
MapOptions opts = MapOptions.newInstance();
opts.setZoom(9);
opts.setCenter(center);
opts.setMapTypeId(MapTypeId.HYBRID);
MapTypeControlOptions controlOptions = MapTypeControlOptions.newInstance();
controlOptions.setMapTypeIds(MapTypeId.values()); // use all of them
controlOptions.setPosition(ControlPosition.TOP_RIGHT);
opts.setMapTypeControlOptions(controlOptions);
mapMarinePark = new MapWidget(opts);
mapMarinePark.setSize("100%", "100%");
// Add some controls for the zoom level
List<EuropeanMarineParkDataEntity> parksPerAnio = null;
listPolygon = new ArrayList<Polygon>();
Polygon poly = null;
for(int i=2003;i<=ANIO_MAP_PARK;i++){
parksPerAnio = this.hashAnioParks.get(""+i);
if(parksPerAnio != null){
for(EuropeanMarineParkDataEntity emp : parksPerAnio){
poly = this.createPolygon(emp);
poly.setMap(mapMarinePark);
listPolygon.add(poly);
}
}
}
((Element)DOM.getElementById("currentYear")).setPropertyObject("innerHTML", ""+(ANIO_MAP_PARK));
// Add the map to the HTML host page
final DockLayoutPanel dock = new DockLayoutPanel(Unit.PX);
dock.addNorth(mapMarinePark, 500);
RootPanel.get("mapContainerProfile2").add(dock);
RootPanel.get("timeline").setVisible(true);
RootPanel.get("mapPanel2").setVisible(true);
RootPanel.get("gadget_marinepark").setVisible(true);
mapMarinePark.triggerResize(); --> Does not work!
onLoadedMapMarinePark();
}
I guess you try to draw the map when the DOM hasn't been fully constructed and the wrong dimensions are retrieved.
Try to draw/create the map in a callback of a
Scheduler.get().scheduleDeferred() call.
Update:
Also you are mixing a DockLayoutPanel with a RootPanel.
That will cause issues. Use a RootLayoutPanel instead.
Construct the DOM normally and at the point where you normally add your map to the DockLayoutPanel call scheduleDeferred() and add the map to the panel in the callback
I m working with GWT 2.4 on an new application. I made a docklayoutpanel and I inserted a celllist on the west section of it. I need to create an event, every time a user clicks on an element of celllist on the west side of page a specific widget will load at the content of the docklayoutpanel.
Any suggestions?
Thank you
The following example should be self explanatory
// Create a cell to render each value.
TextCell textCell = new TextCell();
// Create a CellList that uses the cell.
CellList<String> cellList = new CellList<String>(textCell);
cellList.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);
// Add a selection model to handle user selection.
final SingleSelectionModel<String> selectionModel = new SingleSelectionModel<String>();
cellList.setSelectionModel(selectionModel);
selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {
public void onSelectionChange(SelectionChangeEvent event) {
String selected = selectionModel.getSelectedObject();
if (selected != null) {
Window.alert("You selected: " + selected);
}
}
});
Instead of Window.alert("You selected: " + selected); you will need to change the widget shown on the eastern side of your panel.
This can be done in several ways, one of which is to expose the Dockpanel to the Selection Change Event either by declaring the Panel as a field to the class (not a local Variable in the constructor of the class) or as a final local variable in the constructor.
Another way is to do this by event handling. The eventBus methodology on the MVP design pattern is the proper way to do all thesee here for more information.
I want to add two fields in a vertical field manager. I want the first one to be align on the left and the second one (on the second line) on the right.
You can use the style argument of the field constructor to specify alignment, both horizontal and vertical.
VerticalFieldManager titlevfm = new VerticalFieldManager();
LabelField leftField = new LabelField("my label", Field.FIELD_LEFT);
LabelField rightField = new LabelField("right field", Field.FIELD_RIGHT);
titlevfm.add(leftField);
titlevfm.add(rightField);
You can also create a class that extends Manager class
Override the sublayout method and place contents as per your choice