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Introducing PyQt4* for GUI Application Development. David Boddie. Torsten Marek [email protected] [email protected] EuroPython , CERN. Short Cuts are short, concise, PDF documents designed specifically for busy Rapid GUI programming with Python and Qt: the definitive guide to PyQt programming / Mark fast-paced Python tutorial as well as some PyQt coverage. . examples and exercise solutions can be downloaded, is http://www. aracer.mobi What are Qt, PyQt and Qt Designer? 2. PyQt Basics. 3. A Simple Example. Widgets and layouts. Signals and slots. 4. A More Useful Example. Actions and.
That is where the name of the object is. The name is the way this object will be called from our Python code, so call it something sensible.
The next thing we will do is attach a label to the box, to make it clear to the user what this box is for. Above, I have circled the label.
Drag it across to the main window. It gets the default text of TextLabel. Double click it and change it to Price. You can also make the text large and bold, as seen here: For the tax box, we are going to use something different. See the spin box: The circle on the left is a spin box. This limits the values you can enter.
Remember, this is how this object will be called from Python.
This is the same process that you see done with other forms of Graphics in programming, like games with PyGame, or graphing with Matplotlib. The reason for this is graphical rendering is cumbersome, and it would be rather inefficient to continuously be making edits and refreshing to the user's screen for each element. So, when we modify the window like this, it is not like the window will pop up full screen, and then change shape moments later. The screen has not yet been shown to the user, we're just building it in the memory.
QWidget class. It is taking four parameters from us. First you have the window's starting x coordinate, then you have the starting y coordinate 0 and 0. Next, you have the window's dimensions, which are and , meaning pixels wide and tall. Next, we can do something like: window.
This will make customizing go smoother.
This first section on custom windows is for your typical, blocking, non-persistent window. By this I mean, when you "show" the window, the function will not return until the user has clicked a button or closed the window.
When this happens, the window will be automatically closed.
Two other types of windows exist. Persistent window - rather than closing on button clicks, the show window function returns and the window continues to be visible.
This is good for applications like a chat window. Asynchronous window - the trickiest of the lot. Great care must be exercised. Examples are an MP3 player or status dashboard. Async windows are updated refreshed on a periodic basis.
It's both not enjoyable nor helpful to immediately jump into tweaking each and every little thing available to you.
Better yet, the window designer requires no training, no downloads, and everyone knows how to use it. It's a manual process, but if you follow the instructions, it will take only a minute to do and the result will be a nice looking GUI. Enter a number Popular beginner programs are often based on a game or logic puzzle that requires the user to enter something, like a number.
The "high-low" answer game comes to mind where you try to guess the number based on high or low tips. This tutorial only focuses on getting the window code written, not the stuff to display it, get results.
We have only 1 element on the first row, some text.
Rows are written as a "list of elements", so we'll need [ ] to make a list. Here's the code for row 1 [ sg. Text 'Enter a number' ] Row 2 has 1 elements, an input field. Input ] Row 3 has an OK button [ sg. OK ] Now that we've got the 3 rows defined, they are put into a list that represents the entire window.
Text 'Enter a Number' ], [sg. Input ], [sg. OK ] ] Finally we can put it all together into a program that will display our window. Window 'Enter a number example', layout.
Read sg. Popup event, number Example 2 - Get a filename Let's say you've got a utility you've written that operates on some input file and you're ready to use a GUI to enter than filename rather than the command line.