GTK+ 2.x has the follow states: NORMAL, PRELIGHT, ACTIVE, INSENSITIVE, SELECTED for use in GTK themes and I can do things like...
bg[NORMAL] = "#f6f6f6"
.. to change background color when in NORMAL state.
Also, I can change the background image of a button (when the mouse is over it) by changing the PRELIGHT state image.
But I was not able to find a way to change the button background when the user cycle the focus using the TAB arrow (ie. when a dashed rectangle appears around the button). I want to do this using themes in gtkrc, is this possible ?
I don't think so. The RC file documentation doesn't even mention "focus", so I don't think it's possible to theme that in this way.
Related
I want to make my own scrollbars for a custom drawn plot, like this image, what would be the best way to go?
Scrollbars should:
Only be visible when mouse hover over it (with fade in/out)
Be a part of the x/y axis of the plot, like in the picture
Not have any arrow buttons, just the thumb Thinner than the normal scrollbars
Would you suggest to:
Create everything from scratch, handling paging, scrollwheel etc.
Try to inherit CScrollBar and do my own drawing?
From what I've read, it's not very easy to customize scrollbars in MFC, for example here)
First off, these have to be scrollbar (or other) controls, not window scrollbars (used for scrolling a window).
Second, the statement "it's not very easy to customize scrollbars in MFC", is only partially true. MFC is a "thin wrapper" of Windows API, so you should better refer to the documentation of the Windows scrollbar control.
Then there is the CScrollBar class, but took a short look, and indeed, it does not really offer anything more than the Windows scrollbar does. As for the sample in the link you posted is a new (custom) control (painting everything on its own), i.e. literally "from scratch", not inheriting anything from CScrollBar.
So, you have to look into the Windows scrollbar control, and what it offers. Did take a look, and saw few things. Unfortunately there seems to be no owner-draw functionality. You can process the WM_CTLCOLORSCROLLBAR message, but this only allows you to change colors.
And according to the documentation the background color only. This appears to be the only possible customization, apart from the SBM_ENABLE_ARROWS message, which can hide the arrows. And no fading effect. If these are enough to you, you could try the Windows/MFC scrollbar, otherwise try writing your own.
I've a QTreeWidget and need to disable the mouse over highlighting on the childItems but not the click selection. The point here is, that I need to set this per Item because some are selectable. I was thinking about the QTreeWidget::itemEntered signal to check if the item should be highlighted or not but I can't get it to work because the description says
QTreeWidget mouse tracking needs to be enabled for this feature to
work.
and I can't figure out how.
So my questions for are: How can I enable mouse tracking?
Is there an easier way to disable the highlighting?
Simply invoke setMouseTracking() to enable mouse tracking for a specific widget.
I ran into this problem (I know this is an old post, but I might as well post my solution, since it can be useful for others).
I could not properly disable the mouse feedback while keeping the mouse tracking enabled, but I could make this feedback invisible. I'm using qss stylesheets, and I set the mousehover feedback color to transparent:
MyTreeWidget::item:hover {
background-color: transparent
}
It did the trick for me. Sadly it makes the feedback invisible all the time, rather than allowing to turn it off and on.
So as a next step, for when I needed it, I implemented my own feedback by using a delegate and overwritting the paint function.
The QTreeView overwrite mouseMoveEvent and sends mouse coordinates to the delegate. This way, the delegate can adapt what it does in paint to this position. It feels pretty heavy, and a bit dirty, but it works. Delegate should also allow to have different behavior for different items.
PS: If you're using a delegate, in most cases, that should be enough without the qss change. In my case it wasn't, because I call QStyledItemDelegate::paint in my overwritten paint method, so I inherited some unwanted behavior.
When a ListView item is selected, its color changes to indicate that it is selected. Now what I want to do is to disable this visual effect and implement my own, so for example I want when an item is selected to draw a rectangle around the item.
How can I do that? (Note that I am talking about the Icon view).
This is a case for custom drawing of controls.
It's all about handling the NM_CUSTOMDRAW notification and then to draw the control more or less by yourself.
I've never done it by myself changing the appearance seriously but I've change background colors of controls using this mechanism.
There is a lot of information about this on the internet...
I'm trying to change the background color of a button upon clicking it. I've connected the button to a clicking method just fine, but I can't seem to find the correct c++ syntax to create this. I've seen it done in python, but that doesn't exactly help me. Anyone have a tutorial or know the syntax?
EDIT: That makes sense. Thanks!
Buttons don't have color, they contain a child object and emit a signal when pressed, that's it.
You are likely putting a Label in the Button as the child object. A Label is text rendered by Pango, which lets you set attributes. What you think is the Button color is actually the background color of the Label text.
Gtk is pretty complex, but lets you do anything. If you want to do much with Gtk, look for a tutorial on Pango (text) and Cairo (images). If you want a simpler self-contained widget set, check out wx or tk.
I am implementing drag and drop of button on windows application.During dragging I want to display some dragging effect. I think image of the button would be appropriate to display during dragging.
Also I think cursor should be changed during dragging.
My doubts are:
How to capture the image of button and display while dragging.
What type of cursor should be displayed during dragging.
Application is in C++, win32.
Drag image:
If it is a standard button control then you should be able to use WM_PRINT or WM_PRINTCLIENT to ask it to draw itself to a GDI HDC (i.e. into a bitmap that you then use as the drag-image).
Note that not all controls support those messages and some of them support them in slightly different ways. Sometimes you have to experiment a bit or have custom code-paths for different controls.
Another way is to draw the button yourself using the visual styles (themes) API, with a fallback on DrawFrameControl for when themes are disabled. But that is much more tedious than using WM_PRINT/WM_PRINTCLIENT if you don't need it.
Cursor:
Depends what the operation is doing, really. Note that you get the copy and move cursors for free with the shell drag object, if you want them. Sometimes it makes sense to use a custom cursor, though.