I'm trying to show the "selection" of a certain sub-string in a
gtk.TextView by drawing a border around the word. The only way to mark
text in a TextView that I've found so far is by placing TextTags with
modified properties. This does not seem to offer a way to draw a border,
though, DOES GTK SUPPORT THIS OR IS THIS A PROBLEM WITH ONLT PYGTK
I figured out how to draw on a text view !!!
To begin with lets assume the reference to your gtk.TextView is in a variable called viewer, Inside one of ur classes
Also the draw function has to be called with an event called expose-event else the drawings will be refreshed and will not stay on the screen
The next part is the gtk.TextView consists of 7 types of gtk.gdk.windows on which u can draw
gtk.TEXT_WINDOW_WIDGET
gtk.TEXT_WINDOW_TEXT
gtk.TEXT_WINDOW_LEFT - not displayed by default
gtk.TEXT_WINDOW_RIGHT - not displayed by default
gtk.TEXT_WINDOW_TOP - not displayed by default
gtk.TEXT_WINDOW_BOTTOM
gtk.TEXT_WINDOW_PRIVATE
For the drawing to appear on gtk.TextView We have to draw on gtk.TEXT_WINDOW_TEXT
An Example Code is as shown Below
if(viewer!=None):
viewer.connect("expose-event", expose_view)
self.drawable=viewer.get_window(gtk.TEXT_WINDOW_TEXT)
def expose_view(self,window,event):
if(self.drawable!=None):
self.drawable.draw_line(self.drawable.new_gc(),1,1,30,30)
# (1,1) and (30,30) are the coordinates and u can give the values accordingly
In a gtk.TextBuffer tags are used to set one or more pre-defined text attributes. Without subclassing, this is limited to the properties of a gtk.TextTag, and doesn't include anything akin to a border or outline property. There is no difference between PyGTK and plain GTK+ in this regard.
While somewhat hacky, the easiest way to do what you want to do is to connect to the expose-event of your gtk.TextView, get the coordinates of your string and draw on event.window, which is the gdk.Window of the event provided in the expose callback.
(Note that you don't have to get and store the gtk.TEXT_WINDOW_TEXT window, you just need to check what window the expose event is for in the callback, probably ignoring the expose if it's not for the text window.)
Instead, you could presumably subclass one or more of TextBuffer/TextView/TextTag to add a border tag, but whether it's reasonable to do so is another question.
Related
I'm working on a GTK program in Rust (someone can probably answer this if they don't know Rust, as I can figure out how to translate between different bindings and the native C API) via the gtk-rs bindings for which I want to have a non-editable TextView who's contents are constantly updated in my code. I want the user to be able to resize the TextView to any size, after which my code will re-calculate its contents accordingly. Unfortunately, GTK prevents any resize from taking place that would hide any contents that are current in the TextView. I can't use a ScrolledWindow because I don't want visible scrollbars, and disabling the scrollbars on a ScrolledWindow prevents the resizing behavior that I want. I also tried calling set_size_request to set the size to both 1, 1, and 0, 0 after every text change, but this does not change the behavior at all either — the user still can't properly resize the TextView (by resizing the window).
How can I enable the resizing behavior that I want?
Probably this is not possible. What would be the point of resizing the text view smaller, if the user can never see the text that is outside of the viewport because you don't want scrollbars? That seems like it would confound the user's expectation of how such a component would usually work.
Maybe an approach could be that you pick a certain number of lines to show, make that the size of the viewport, and delete the old contents of the text view that scroll outside of the viewport?
At the moment I'm writing a tool to extract parts of frames of mp4-video files. You draw rectangles on the video and the tool extracts .png-images at regular intervals. Now I want to give the user the ability to edit the properties of individual rectangles they have drawn on the video (exact position, frequency of frame extraction, time frame, etc.). I like the approach that QtDesigner takes for editing ui elements. You can see what I mean in this screenshot i found on the internet
The yellow and green table contains name value pairs for the different properties of the selected ui element. The table is devided into section depending on what class the property was inherented from. In the Screenshot the green part is inherented from MarbleWidget. The yellow part is inherented form a different class. I want each division to refer to a different rectangle and the color to match the colour the rectangle is drawn in on the screen.
I've tried using QTreeView, QTableView, QToolBox and QTableWidget but none of these - to my knowledge - offer putting QWidgets in the "value" part of the table. In the screenshot you can see tick boxes for example. In my case I would want to use a range slider. Does anyone know what class is used to Implement this table?
I think you'll find it difficult to use the designer classes in a normal application.
See qtpropertybrowser for a properties editor.
See setIndexWidget for a static widget. As it says, use QItemDelegate for dynamic widgets. Note that the specific item subclasses have their own methods like QTableWidget.setCellWidget.
I have developed an application in PyQt5 that displays an image and allows the user to pan the image using the mouse and zoom using the mouse wheel. I now need to add the functionality to show popup text associated to specific parts of the displayed image. While painting the text directly on to the QGraphicsScene is a possibility, the range of zooms that are commonly used means that the text will be much too small when zoomed out, or much too large when zoomed in.
I would like to achieve a way of placing the QGraphicsTextItem widgets at a static location that is not affected by the pan and zoom. This way, they can be statically located around the perimiter of the QGrapicsView, and I can draw a line from the text box to the position in the scene. My problem is that I cannot find a way to place the text items so they are independant of the QGraphicsScene. I am thinking that I should have the text items external to the scene, and place the QGraphicsView and any text boxes in a parent QObject. I cannot figure out if this is the best method, and have had limited success with trying to connect a line from QGraphicsElipsesItem that marks the position on the image, to a QLabel in the parent QObject.
I hope I have made this clear enough. Please comment if it needs more clarification.
I have a line limit with a label. I would like to replace that label with an image. I realize the ios-charts library can't do that directly but was looking for some insight on how to do this.
There are several ways to do so:
Add the image outside of the ios-charts system, you can calculate the position of the image, and add it there;
You can subclass the ChartLimitLine, add a new property called UIImage, and then you can use it. You may subclass the chart view as a child chart view, and you can add your child limit line there, and then add the image to the view.
If the image is not complicated, such as simple lines and dots, you can choose to manually draw the shape using CoreGrahpics.
It's quite flexible for you to choose a proper way to do that. Just remeber you only need the origin point and the size, then you can add your image wherever you want.
Doing customization requires you understanding OOP and ios-charts in depth.
This question already has an answer here:
NSTableView with +/- buttons like in System Preferences using only Interface Builder
(1 answer)
Closed 7 years ago.
I'm building an OSX app and want to create a set of controls similar to what's found at bottom of the standard Network Preferences configuration panel. I'm running into some layout problems that I wouldn't have expected.
These are my specific questions:
What contains the 3 buttons so there's similar shading all they way across the row where the buttons are positioned? In particular, what's causing the area without buttons to have shading?
How do you do this without getting a double border where the row of buttons meets up with the table?
I want to do this with an xib file. This may be incredibly simple, but I'm missing something I guess.
I find that if you make a button with style "Gradient" and type "Momentary Change", then it looks like the other buttons but does not respond to clicks, so you can use that as the area after the last button. (The NSMomentaryChangeButton is documented as changing the image and title when clicked, so if you don't use an image or title, nothing should change.)
If you check Refuses First Responder in the attributes inspector, then it will not be possible to highlight this blank button using Full Keyboard Access.
Ken Thomases also brings up the issue of the blank button being shown as a button to Accessibility. One can fix that by using a subclass of NSButtonCell that has just one method:
- (BOOL)accessibilityIsIgnored
{
return YES;
}
I think that's easier than writing a custom view.
As d00dle says, avoid double borders by slightly overlapping things.
Since you want the slack space to have the same background as the buttons, and since the buttons can change appearance from release to release of the OS, the best thing to do is to get the frameworks to draw it like it would the buttons.
Rather than using an actual button as JWWalker suggests, I have used a custom view that leverages NSButtonCell to draw the background. The advantage is that you can be sure there's no chance of getting undesirable behavior. For example, a button could get focus (for users who have All Controls selected in System Preferences > Keyboard > Shortcuts > Full Keyboard Access) so that the user could Tab to it. Accessibility will report the presence of the button through VoiceOver. Etc.
Configure the button cell just like the buttons (set buttonType and bezelStyle). In the view's -drawRect: call [buttonCell drawWithFrame:rect inView:self];, where rect is similar to the frames of the buttons. Since one way to avoid double borders is to make the buttons larger than the view's bounds, you may need to do the same for rect. For example, you might want to use NSInsetRect(self.bounds, -1, -1).
The buttons are buttons... This can be accomplished with a custom view drawing border and the background "shading".
To avoid the double border where the table and the custom view meet you simply align it so they overlap by 1 point (pixel) or avoid drawing the top border in your custom view.
I don't know of any standard object capable of doing this.