I am making a small library that lets me make some graphs for a different project I'm working on (I don't want to download another library), and I set it up so each type of graph (pie, bar, line) extends JPanel, and everything inside those graphs (Points, lines, grids) are extensions of JComponent. But in some times, like when making the grid, I need to know how much space the JPanel takes up on the JFrame.
Is there any way to find out how big a JPanel (has to be resizable) will be on a JFrame from a JComponent?
while it is easy to find information from top down, A JFrame can get from a JPanel which can get from a JComponent, but I cant do the opposite, have a JComponent get from a JPanel which would get from a JFrame.
thanks in advanced!!
EDIT: figured it out, look at my answer to see it.
Are u talking about how to set size on JPanel?
JPanel f=new JPanel();
f.setSize(500,500);
If you want to resize,u may use action listener
To do what I was asking in the OP, all you need to do is put at the size of the frame itself as an argument in the methods that do the drawing, it was much simpler than I was making it out to be... I was originally trying to access the information without it being an argument, but I don't think that is possible, so if you have the same problem as I did then just pass it through the methods as an arguement.
Related
I have a problem with g-leaflet - it shows as a grey rectangle only (with a bit of the map at top left) until I resize the window (manually). Then it shows up. Sometimes parts of maps show when I hover over an area but this too is incomplete and problematic. Here:
The code that I use to add the G-Leaflet map to my GXT VerticalContainer (com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer) is as follows, taken from G-Leaflet example:
LeafletDrawResourceInjector.ensureInjected();
final MapWidget mapWidget = new MapWidget();
mapWidget.setSize("1000px", "750px"); // I added this myself to try to fix the issue
myVerticalLayout.add(mapWidget);
(I also set the size of the "myVerticalLayout" container).
Please help!
Leaflet is really finicky. Scheduling a defferred call to invalidateSize() was not enough. Had to make my own JavaScript call to its invalidateSize using setTimeout, also making sure that all the containers are attached before this happens. Only hen it would show.
I'm new to RCP and I'm trying to create a new View or Editor. At the current state I'm extending ViewPart.
The Layout I want to achieve is a SashForm where both sides have a CTabFolder. One of the sides of the SashForm is basically a MultiPageEditorPart. One of it's tabs should be an editor for a specific language with syntax highlighting and similar features. From what I understand I could extend AbstractTextEditor for that (and maybe use it as one tab of a MultiPageEditorPart).
If I try to achieve this layout with a ViewPart as top level container which contains a SashForm, I can't add an EditorPart to one of the sides of the SashForm. Of course I could implement this editor from scratch as Composite but I want to avoid that.
I am also willing to use an EditorPart or MultiPageEditorPart as top level container but then I'd have to find a way to get the SashForm layout working. The whole editor should be splited first and then each side should have tabs.
Does anyone have an idea how to solve this?
If anything is unclear please ask. I've got the feeling I've put this into words a little complicatedly.
I think you should just make a ViewPart that has a text editing component of some kind on the left, instead of trying to find a way to use an EditorPart. All that EditorPart is really buying you is dirty flag management and Save support; syntax highlight and so forth you can add to the text editing component yourself (I was surprised at how few drop-in text components I found while poking around the internet just now; I expected to find "a few" and instead I found "basically none").
You can see one way to do very rudimentary syntax highlighting with a StyledText component here: JavaSourceCodeViewer
To see a more robust implementation of things like syntax highlight and autocomplete, take a look at the class that Eclipse uses for the editing of Java source code: CompilationUnitEditor
I think what you are trying to achieve is quite complicated and might require a lot of extra work. See an editor is not just different controls laid out in some order, but it has a lot of additional features that any editor class expects to work. These include things like selection service and action bars etc, that you will need to hook in to ensure smooth running.
That said, it should be possible to achieve what you are hoping for. You can have a look at the source code of the MultiPageEditorPart itself to see how it converts a single editor into a multi page editor, which is capable of hosting a completely independent editor on each of its pages. You would need to achieve something similar if you want your editor to host two MultiPageEditorParts separated by a sash. If you want to carry on, you should start implementing some stuff and if you run into any problems, post them here. You would be able to get a lot better help then.
You need something like MultiPageEditorSite. Use it for inspiration when implementing an EditorSiteDelegate. MultiPageEditorSite has support for separate keybindings between the pages, for example.
class ChildEditorSite implements IEditorSite {
IEditorSite parent;
public Object method() {
return parent.method();
}
}
Using this class, you can easily do the following in your main EditorPart:
class MyCoolPart extends EditorPart {
public void createControl(Composite parent) {
EditorPart child1 = new MyChild();
child1.init(new ChildEditorSite(getEditorSite()), myInput);
EditorPart child2 = new MyChild();
child2.init(new ChildEditorSite(getEditorSite()), myInput);
child1.createPartControl(parent);
child2.createPartControl(parent);
}
}
Be sure to also dispose of your children correctly when you dispose of your MyCoolPart. Please note that this only works in the most basic of cases. An EditorPart that is a DocumentEditor or that relies on IPersistablePart or implements listeners/adapters for confirming a save is probably going to require a lot more Lifecycle management...
I'm making a GUI project in NetBeans. I have a JFrame and 3 JPanels. Only one of the JPanels should be displayed at a time. The JPanel that is displayed should be changed using a menu option (the listeners work).
My question is, how do I switch them out? I've tried removing the old JPanel and putting in the new JPanel. I've tried adding a fourth JPanel into the JFrame and having all three JPanels exist within the fourth, so I can use removeAll() (bad technique, but I was desperate). I've tried redirecting the object reference so that it points to the new JPanel instead of the old one. In each case, I've finished off the code snipped with
revalidate();
repaint();
To no avail. I've seen a lot of talk about CardLayout and GroupLayout but I have no idea how to implement them using the NetBeans GUIBuilder. Could one of you fine people tell me how to switch out the JPanels?
Use a LayeredPane. 30charactermin
I'm developing an application that periodically draws images on a GTK Drawing Area inside a window.
The rendering first works well and the window content gets repainted if I drag another window over the drawing one, but after some random amount of time (some seconds), the window stops updating itself.
New images dont get displayed, and if I then drag another window over the rendering one I get this:
When I click one of the checkboxes below my drawing area, the window gets refreshed and the problem is gone for another few seconds.
Any idea what could make the GTK threads stop updating the window content?
I dont know which part of my code is of interest to answer that question, so I pasted the mostly full version here.
My GTK-main() is called like this:
void window_main()
{
pthread_create(&drawing_thread, NULL, img_draw, NULL);
gtk_main();
gdk_threads_leave();
}
Thanks for any hints! :)
Found the solution: in the original example code I used (here) they use a g_timeout_add() to register their periodic drawing function.
The g_timeout_add()-registered function is run by gtk_main(), which means it is protected internally by gdk_threads_enter() and gdk_threads_leave(). That's the point I was not aware of.
Surrounded my call to gtk_widget_queue_draw_area() with these two functions and the bug is gone 8)
I want to display a simple GIF image in a VBox using GTK+ from C. I know that I need to use a GdkPixbuf. But as usual there are no example of doing it. Can anyone provide help?
Also: In GTK+ how can we add a PNG image as background to a widget? Can anyone provide an example?
Forgot something to add this:
forgot to tell u that i am using Glade to develop GUI...
And i have created vBox in Glade and in one of the blocks of the vBox i need to display FIG Image....
Sorry of this...
gdk_pixbuf_new_from_file() -- but see unwind's answer for a better way to do it using a GtkImage widget.
You need to set the background pixmap field in the widget's style structure:
GtkRcStyle *newstyle = gtk_widget_get_modifier_style(widget);
newstyle->bg_pixmap_name[GTK_STATE_NORMAL] = g_strdup(pngfilename);
gtk_widget_modify_style(widget, newstyle);
PS. You can often find code examples by doing a Google search for the function you need an example of. The GTK docs usually don't contain examples for every single function, because that would clutter them up, and the documentation of functions like gdk_pixbuf_new_from_file() is usually pretty straightforward. I've noticed you often post this kind of question and I'm wondering if you are looking for the documentation in the right place. For example, are you using the excellent reference tool DevHelp? On the other hand, the GTK documentation is really missing some important information in a few places. If you have some improvements, why not contribute to the documentation?
A vbox in GTK+ is a widget, that displays other widgets as its children, stacking them vertically.
Unsurprisingly, there is a GTK+ widget dedicated to displaying images; it's called GtkImage. You should use the gtk_image_new_from_file() call to create one, passing it your GIF filename, and then just add that to your vbox. There's no need to create the underlying GDK image yourself.