Currently if I make a window in GTK3
For example 300x300
And I put a button at the bottom, right hand corner, I can not shrink my window
Size because this button is preventing me is there a function in gtk3 that can allow me to ignore all widgets, and resize to anything even 0x0
And this is the user doing this with the window resize, drag and click
And is there a way where I can set this resize limit myself, and not have this dependent on whats in my window
If you initially use set_size_request() to set the window to 300x300, then it won't shrink below that. To allow users to shrink below an initial value, use set_default_size(). I seem to have read that the minimum size of a widget is 1x1, which seems logical, as, at 0x0 you wouldn't be able to resize it anymore. If you want less than 1x1, you can use hide() and just hide the contents.
But if you have any widgets inside the window, then the minimum size is determined by the widgets! (Called the 'natural size')
To allow a window smaller that than the one determined by the widgets, you can maybe use a Gtk.ScrolledWindow.
Also, recall that the outer border is drawn by the window manager, NOT by Gtk. However, you can disable the outer border by using set_decorated(). Not that this may not work - depending if the window manager respects this (not Gtk's fault).
Related
I have a bit of an issue that involves a CMFCPropertyGridCtrl.
Normally you assign a window size to it and if it cannot fit it sets up a vertical scroll bar (for all I can see this is just the normal generic CWnd associated scrollbar). And this is great for when you just want to dump the control inside a re-sizeable window.
However, I have the reverse situation, where I would like to fit my outer window so that it shows the entire height of the control (such that no scroll bar needs to be created). In order to do that I somehow needs to get an ideal height given the contents of the control. Is that possible in some generic way or just for CMFCPropertyGridCtrl ?
To give a little more background, I have multiple gridctrl's on top of each other so to speak. Therefore, I have put a scrollbar on the outer window so you could say they share that scrollbar (and this one is working just fine). I could go into details why I want this design(as opposed to just one gridctrl with everything), but basicly it's a kind of cards where each card/element has it's own set of properties.
I want the user to be able to vertically resize the Window but I'm unsure how I would do this. I have selected my root object (View of type QWidget) in Qt Creator but I do not see an option to allow users to vertically resize the object. Does this have to be done through code?
By default, if a QWidget is the top-level window you are able to resize it given that the minimumSize and maximumSize are different since they indicate the range of resizing.
If you want to let the user to resize vertically only, then you just have to set both minimumWidth and maximumWidth to the same value (probably to the current width of your QWidget). Qt will take care of indicating the underlying windows manager the rest.
You can do it in the Designer or programmatically using the setMinimumWidth and setMaximumWidth methods. Edit: As mentioned in a comment, there is a setFixedWidth method that simplifies this operation (and make it more explicit in your code).
Of course, you can play with the combinations such as setting a minimum width (or height, or both -minimum size-) to avoid your top-level window to collapse and become unusable, setting a maximum size... One common setting is making minimumSize = maximumSize, so you make the window fixed size (you can use the convenience method setFixedSize).
PS: see that this has nothing to do with the sizePolicy, which simply indicates parent layout which actions can be taken -regarding size- when placing the widget. As a top-level window has no parent layout this policy is simply not used.
I use QSplitter to place some widgets side by side.
Being a user, I can resize those widgets just dragging a splitter.
Being a programmer, I don't know how to specify exactly what width and what height do I want at the moment.
That's my original state (adjusted by different stretches).
I tried to use setFixedSize(), but after that call the user can't resize widgets by itself anymore (and that's definitely correct behavior, because the size gets 'fixed').
If I use resize(), it has almost no effect. The widget is resized, but (!) incorrectly and (!) when I start dragging again the widget gets its initial state.
Is there any way to resize that left widget in code correctly? I don't want to have fixed size but resize() doesn't work properly, as you can see. So what should I do?
QSplitter hast its method QSplitter::setSizes(QList<int>) where each entry in the list is the size of the widget in pixels, from left to right or top to bottom respectively. The method does not require you to know the exact width, it still works with guessed sizes.
I use this functionality for instance to store the user defined sizes (obtained by QSplitter::sizes()) in a QSettings instance on the program shutdown and reapply them when the software is started again. If they are not set for some reason I just set the overall width divided by the number of widgets in the splitter and it works fine enough as an initial state.
I wanted to develop a widget container (still on python 2.7 and gtk2), which would be placed in a scrolled window, and could be freely moved and resized in the window, such that: click & drag within the widget would move it inside the window; and when widget's corners / edges are visible in the window, it would expose drag handles for resizing - otherwise, if it is bigger than the window area, it would scale up and down (zoom in and out) on middle-click.
Of course, I want to keep the amount of custom coding of this widget to a minimum, so I though looking into what's available in gtk2 first. It turns out, the only element exposing resize drag handles is gtk.Window - and at that, only if it is a main (or root) window; otherwise, if a window is placed inside a widget, its size is apparently set by the widget, and so there are no drag handles (not menus, titlebars etc). I was wandering why this is - and it seems it is due to multiple document interface (MDI) being considered evil by gtk developers, see e.g. Re: [gtk-list] Resizing widgets with a mouse or Does GTK support MDI? - Linux/BSD whirlpool.net.au.
Just to demonstrate the behavior that I want, I used a PyQt4 code from Python PyQt/PySide QMdiArea subwindows scroll not working in TabbedView - Stack Overflow, since as it turns out, Qt does have an MDI area. So here's the gist of it - if a corner is visible, a resize drag handle appears, and resize drag action can be started:
When you thus drag the corner outside of the window - the scrollbars automatically indicate the new size/position of the inner widget (note the window got also moved a bit in this screenshot below, that was manual and unintended):
Again, I don't really need a window (as in titlebars, menus) - just a widget container that would behave in this way, so I could put e.g. a table (e.g. TreeView) or an image in it, as the situation demands - and at least not worry about recalculating the "outer" scrollbars (naturally, I'd expect I'd have to code the rest of my custom behavior myself). Also, I just need a single widget placed in a window like that for now (so no "multiple document"s).
While Qt seems to offer this in a way, I don't have the possibility right now to get into it to the level of doing something like this; and the same goes for WxWindows (see e.g. wxPython-users - How to resize Widgets? - possible, but as there is no code there, I cannot see if geometry calculation coding is required or not).
So I was wondering - is there a widget I may have missed, that would implement the above behavior, and that I could take as a base for customization? If not, what options do I have to implement something like the above on gtk2 (eventually with Python)?
I'm not sure this would work, but I suggest looking into GtkOffscreenWindow; put the inner widget into that, and render it to a GtkDrawingArea inside a GtkScrolledWindow. This would probably make the scrollbars behave properly depending on the size of the drawing area.
What you won't get:
window titlebars, you'll have to render those yourself because GTK doesn't know about them, they're part of the window manager. (Note, the inner window in the Qt example has a different titlebar than the outer window - I suspect this is the same thing.)
drag handles to resize the window, you'll have to code those yourself, as you expected.
You might also want to look at how the Glade GUI designer does this.
I have an instance of QDialog, populated by widgets using code generated by uic. The dialog contains a few labels laid out vertically, and I am popping the dialog from time to time to show some text in these labels. The text can be multi-line and its length is not pre-determined. I set the vertical size policy to fixed, so the user can't drag it (doesn't make sense), but I also want the dialog to change its size before being shown to accomodate for the current size of the labels.
To this end, I was calling QWidget::adjustSize() on the QDialog before displaying it, but it doesn't work as expected. When the dialog is shown, it seems to retain the (wrong) size from the previous displaying, but when I click the mouse in the (disabled) vertical resize mode, the dialog suddenly "snaps" to the (correct) adjusted size.
Is there any way to make my dialog appear correctly?
EDIT: I tied rubenvb's advice, and ended up with this:
QSizePolicy free(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
QSizePolicy fixed(QSizePolicy::MinimumExpanding, QSizePolicy::Fixed);
dialog->setSizePolicy(free);
dialog->adjustSize();
dialog->setSizePolicy(fixed);
dialog->show();
Unfortunately, that didn't seem to change anything.
This isn't the answer you're hoping for, and it may not apply to what you're trying to do, however, the only way that I was able to adjust the dimensions of a QWidget at run-time was by handling the object's resizeEvent(..) method. This allowed me to calc the size of items based upon the font being used, number of lines, available space, etc., and then adjust their size accordingly before passing the 'event' on to the base resizeEvent(..) method.
My approach used a single QWidget container within a window, below a header, above a footer status area, and to the right of a column of menu buttons. The widget container, inside the resizeEvent() call, would look at the objects it was going to display, calculate the font heights being used, and then resize some items according to their dimensions (because of how the style sheet selected fonts and colors, etc) and then adjust the sub-widget dimensions before allowing the container widget to get the resizeEvent() message.
So I wasn't so interested in setting a window size, but I think the container QWidget might work the same way? I was more interested in setting the dimensions to some asthetically pleasing size, depending upon the dimensions of the display.
Hope you find that helpful.
Do everything in the right order:
Dialog is not shown. Dialog is resizeable.
Calculate new size, set new size.
Set dialog to not-resizeable.
Show Dialog.
Hide dialog, go to step one.