PyQT how to change layouts size - python

I am trying to make a GUI that is very similar to Spotify using PyQT
I've already designed the main window and I am struggling with applying the design to QT Creator.
This is what I want it to look like
But I'm trying to use Layouts in order to organize every widget.
For example
Image of the main window, split into 3 parts
like in the sketch I've made the software will be split into 3 parts, left bar, mid which is where the explore title is and right bar.
The problem I have is that I can't control the layouts size and the size of what's below them for example in the sketch the mid bar is wider than the right bar and the right bar is wider than the left bar but in the QTCreator I've no idea how to change the width and height of objects inside Layouts.

The first option (which I personally prefer) is to fill your layout with it's contents first (buttons, labels, etc.). This will already start to scale your layout, if there are more buttons in the middle bar than on the other bars. If your layout still isn't what you want it to be, you can use Spacers. They can push and pull puttons and position the in relation to other parts of the layout, as well as to the layout itself. The scaling will be adjusted automatically according to the spacers position.
This option has the advantage, that your application will be correctly scaled and not completely chaotic when it is run on a device with a display aspect ratio which is not the same as the one of the machine your developing it on.
There is, however, also a minimumSize and maximumSize attribute to the layouts, which provide a much more straightforward possibility, but sometimes cause your layouts to become very weird when adding or removing a button, or changing the text of a label. More on this option can be found in the Qt docs:
https://doc.qt.io/qt-5/qlayout.html

Related

Splitter window display issue

I am writing a program which has a TreeCtrl on the left and a RichTextCtrl on the right.
Following is the code of the splitter, panel and other elements.
The problem is that in windows, the bottom of the treectrl and textctrl is hidden. The statusbar covers the bottom of the splitter. But even after removing the statusbar I cannot see the bottom of the treectrl (hides up to 6 rows).
self.panel=wx.Panel(self,wx.ID_ANY)
self.splitter=wx.SplitterWindow(
self.panel,-1,size=wx.DisplaySize(),style=wx.SP_LIVE_UPDATE)
self.splitter.SetMinimumPaneSize(5)
self.datatree=wx.TreeCtrl(self.splitter,1,style=wx.TR_HIDE_ROOT|wx.TR_ROW_LINES)
self.display=wx.richtext.RichTextCtrl(
self.splitter,1,style=wx.VSCROLL|wx.HSCROLL|wx.WANTS_CHARS)
self.display.SetFont(self.displayfont)
self.handler=wx.richtext.RichTextXMLHandler()
self.splitter.SplitVertically(self.datatree,self.display)
self.logger=self.CreateStatusBar()
I think the issue here may be that you've explicitly told the SplitterWindow to take up the entire display size. Try omitting the size argument to the constructor, or adjust it down some, to see if that has any effect.
If omitting the size parameter does not help, I'd suggest creating Panels with Sizers that contain your Tree and your Rich Text Control, then splitting those Panels vertically within the Splitter Window.

Allow a ToolItem to fill horizontally in a Toolbar

SO.
I've been busy working on a project in python and pygtk. I want to have (at the top) a "Toolbar" with back, forward etc. buttons and a long Entry that would take the rest of the horizontal space. I don't get the desired effect, however, as the space the Entry takes is quite limited.
self.omnicont = gtk.ToolItem()
self.omni = gtk.Entry()
self.omnicont.add(self.omni)
I've tried set_child_packing (which doesn't apply to Toolbars, it seems). I couldn't find any other way.
The buttons I have are declared in this way:
self.bBack = gtk.ToolButton(gtk.STOCK_GO_BACK)
and similar, so I don't think it's possible to put buttons like this in an HBOx.
How can I have the Entry take all the available horizontal space and, if that's not possible, how could I get an HBox to contain buttons with the stock icons?
Accordingly to the docs you can use:
set_expand(True)
on the item you want to expand.

Python : UI Image Wipe, compare two images

I wanted to know if anyone knew where to start in terms of recreating this sort of functionality?
http://www.learningnuke.com/wp-content/uploads/nukewipepreview.png
In the picture you can drag the centre line to reveal Image A or Image B or parts of each, interactively.
I want to be able to wipe/reveal across two images, maybe it's possible doing some sort of interactive crop of sorts.
Wanting to add this feature to a window in Maya, so maybe with QT, but not essential.
Just some pointers would be great.
I can tell you that this is possible via Qt/PyQt in maya. You can create a dialog that displays QPixmaps with some form of mouse interaction to control their display. I would forget about trying to extend the actual Render View as this would be a pain in the ass.
Just focus on a Qt solution. Unfortunately beyond this, I'm not sure what more I can offer unless you have a specific question about its implementation.
I would probably stack the QPixmaps on top of each other inside of custom QLabel widgets. The QLabel would have a custom mousepress/move event that would resize maybe the right edge to simulate the wipe effect, and reveal the one stacked underneath.
Also, it does resemble the functionality of a QSplitter so that might also work, with an image on each side of the layout and a custom style to the split bar.

Difference between "grid" and "pack" geometry managers

What's the main difference between the Tkinter geometry managers grid and pack?
What do you use for your projects ?
If grid is better to align object, what the main purpose of pack?
grid is used to lay out widgets in a grid. Another answer says it "overlays a graph" which is a bit of a misnomer. It doesn't overlay anything, it merely arranges widgets along row and column boundaries. It is great for creating tables and other structured types of layouts.
pack lays things out along the sides of a box. It excels at doing layouts where everything is on a single row or in a single column (think rows of buttons in a toolbar or dialog box). It's also useful for very simple layouts such as a navigator on the left and a main work area on the right. It can be used to create very complex layouts but it gets tricky until you fully understand the packing algorithm.
You cannot use both grid and pack with widgets that have a common parent. Your app may work but it is much more likely to get into an infinite loop as each manager tries to layout the widgets, then the other notices the widgets change size and try to adjust, etc. etc.
The third manage is place. Place is great for doing either absolute positioning (ie: place widget at a given x/y) or relative (eg: place a widget on the right edge of some other widget).
While you cannot mix grid and pack within the same container (a container is typically a frame), you can use both grid and pack within a single application. This is very, very common since each has strengths and weaknesses. I use both on a regular basis.

How do I overlap widgets with the Tkinter pack geometry manager?

I want to put a Canvas with an image in my window, and then I want to pack widgets on top of it, so the Canvas acts as a background.
Is it possible to have two states for the pack manager: one for one set of widgets and another for another set?
The answer to your specific question is no. You can't have two states or otherwise use pack two different ways in the same parent.
However, what I think you want to accomplish is simple. Use the built-in features of the canvas to create an image item that is part of the canvas, then pack things into the canvas as if it were a frame.
You can accomplish a similar thing by creating a label widget with an image, then pack your other widgets into the label.
One advantage to using a canvas is you can easily tile an image to fill the whole canvas with a repeating background image so as the window grows the image will continue to fill the window (of course you can just use a sufficiently large original image...)
I believe that Bryan's answer is probably the best general solution. However, you may also want to look at the place geometry manager. The place geometry manager lets you specify the exact size and position of the widget... which can get tedious quickly, but will get the job done.
... turned out to be unworkable because I wanted to add labels and more canvases to it, but I can't find any way to make their backgrounds transparent
If it is acceptable to load an additional extension, take a look at Tkzinc. From the web site,
Tkzinc (historically called Zinc) widget is very similar to the Tk Canvas in that they both support structured graphics. Like the Canvas, Tkzinc implements items used to display graphical entities. Those items can be manipulated and bindings can be associated with them to implement interaction behaviors. But unlike the Canvas, Tkzinc can structure the items in a hierarchy, has support for scaling and rotation, clipping can be set for sub-trees of the item hierarchy, supports muti-contour curves. It also provides advanced rendering with the help of OpenGL, such as color gradient, antialiasing, transparencies and a triangles item.
I'm currently using it on a tcl project and am quite pleased with the results. Extensions for tcl, perl, and python are available.
Not without swapping widget trees in and out, which I don't think can be done cleanly with Tk. Other toolkits can do this a little more elegantly.
COM/VB/MFC can do this with an ActiveX control - you can hide/show multiple ActiveX controls in the same region. Any of the containers will let you do this by changing the child around. If you're doing a windows-specific program you may be able to accomplish it this way.
QT will also let you do this in a similar manner.
GTK is slightly harder.

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