I am trying to show a progress in the taskbar of the plasma desktop using the KDE Frameworks. In short, it want to do the same thing as dolphin, when it copies files:
I'm kinda stuck, because I don't even know where to get started. The only thing I found that could be useful is KStatusBarJobTracker, but I don't know how to use it. I could not find any tutorials or examples how to do this.
So, after digging around, and thanks to the help of #leinir, I was able to find out the following:
Since Plasma 5.6 KDE supports the Unitiy DBus Launcher-API, which can be used, for example, to show progress
I found a post on AskUbuntu that explains how to use the API with Qt
The real problem is: This only works, if you have a valid desktop file in one of the standard locations! You need to pass the file as parameter of the DBus message to make it work.
Based on this information, I figured out how to use it and created a GitHub repository, that supports cross platform taskbar progress, and uses this API for the linux implementation.
However, here is how to do it anyways. It should work for KDE Plasma and the Unity desktop, maybe more (haven't tried any others):
Create a .desktop file for your application. For test purpose, this can be a "dummy" file, that could look like this:
[Desktop Entry]
Type=Application
Version=1.1
Name=MyApp
Exec=<path_to>/MyApp
Copy that file to ~/.local/share/applications/ (or wherever user specific desktop files go on your system)
In your code, all you need to do is execute the following code, to update the taskbar state:
auto message = QDBusMessage::createSignal(QStringLiteral("/com/example/MyApp"),
QStringLiteral("com.canonical.Unity.LauncherEntry"),
QStringLiteral("Update"));
//you don't always have to specify all parameters, just the ones you want to update
QVariantMap properties;
properties.insert(QStringLiteral("progress-visible"), true);// enable the progress
properties.insert(QStringLiteral("progress"), 0.5);// set the progress value (from 0.0 to 1.0)
properties.insert(QStringLiteral("count-visible"), true);// display the "counter badge"
properties.insert(QStringLiteral("count"), 42);// set the counter value
message << QStringLiteral("application://myapp.desktop") //assuming you named the desktop file "myapp.desktop"
<< properties;
QDBusConnection::sessionBus().send(message);
Compile and run your application. You don't have to start it via the desktop file, at least I did not need to. If you want to be sure your application is "connected" to that desktop file, just set a custom icon for the file. Your application should show that icon in the taskbar.
And thats basically it. Note: The system remembers the last state when restarting the application. Thus, you should reset all those parameters once when starting the application.
Right, so as it turns out you are right, there is not currently a tutorial for this. This reviewboard request, however, shows how it was implemented in KDevelop, and it should be possible for you to work it out through that :) https://git.reviewboard.kde.org/r/127050/
ps: that there is no tutorial now might be a nice way for you to hop in and help out, by writing a small, self contained tutorial for it... something i'm sure would be very much welcomed :)
Related
I am developing a qml app in qt5 with circular gauge. I want to port application qt 6. But in qt 6 qtquick extras is missing, so circular gauge is not available. Is qt planning to make it available in next releases of qt6? What can I do instead of using circular gauge in qt6?
Is there anyone who knows about it?
As far as I know there are no plans yet to port it to Qt 6. You could create a suggestion on Jira to express your interest in having it.
The code is here and here if you want to try to port it yourself or just use parts of it (keeping in mind the license, which is LGPL).
As you stated in the question, CircularGauge is not available in Qt6. So what can you do?
As a minimal effort, you can substitute CircularGauge with a functional similar component, for instance, RangeSlider. Of course, a RangeSlider looks nothing like a CircularGauge, but, it will, at least, allow you to compile and run your application. It will give you an application to test whilst you decide your options.
Then, as others have stated, you need to spend more effort allocated to porting. If you refer to the source code of CircularGauge, you see that they're using Canvas with a custom onPaint implementation. You could do the same in your port, or, you can find an alternative, e.g. Shape with ShapePath, etc. These efforts are non-trivial, and it boils down to the level of effort you wish to invest.
We're using EGLFS to run a QML app on an embedded linux device without a X server. So I can't use the usual techniques for getting a screenshot (e.g. using a screenshot utility app). In this question I found the technique of using QQuickView::grabWindow().
My question: Is the result of this function guaranteed to be pixel-perfect identical to what the user sees on the screen? I'm worried that to grab the window contents, Qt might have to rerender the window using a different code path (e.g. render-to-texture), which may cause results to differ.
I'd like a reliable reference included in your answers, too.
As far as I can tell, the screenshot is not going to be identical. Follow the code from QQuickWindow::grabWindow: it ends up calling qt_gl_read_framebuffer, which is always going to read the image out as RGB(A)8. Your actual framebuffer might be different (for instance, it could be RGB565).
(I also seem to remember that one cannot use RGBA reading via glReadPixels out of a RGB565 framebuffer, but I am not 100% sure that's true in all OpenGL versions/variants...)
Depending on your drivers, a workaround could be reading /dev/fb0 contents. Anyhow, please file a bug report if you need this functionality.
Im new to this forum so be nice ;) i have followed rules :)
I am helping the dev for my kernel that I use. Since the mod I want is mainly only for me i figured its my duty to get it working myself.
The problem:
I have edited my *.kl files to disable the five front facing hardware buttons from waking the device and only allow the volume up / down buttons to wake the device as the front facing buttons get pressed when its in my pocket.
However, even though the front facing buttons no longer turn on the device , when they get pressed they light up adding an extra 6mA drain .
What I've tried:
I wrote an apk to change the permissions of the /sys/class/leds/button-backlight/brightness file to keep them off. Despite the program working , permissions allow the file be edited, causing them to light up.
What i need help on:
I downloaded my dev's kernel using git and I want to edit the kernel myself to keep the button lights off during sleep . However kernel code is not my comfort zone .. so i need help .
Thanks everyone for helping and simply just reading !
1) Messing with code is a bad idea (especially if you lack skill and don't know C and UNIX).
2) what you are probably looking for is script that will run on startup (initrc) and there you need to set it and change permissions using chmod command.
Thus you need to Setup what you want (with echo command presumably) -> change permissions so file can not be rewritten (chmod) -> put two commands in initrc.
Kernel can be like any other configured using make menuconfig and then compiling it, in that case you just disable stuff that you don't like.
[OT] I may be off though, your (original) question (there was no question mark) did not make too much sense here and there. Read this howto: How To Ask Questions The Smart Way from Eric Steven Raymond. Thanks.
When developing a WebOS application with Enyo, is it possible to access the clipboard contents? That is, if I copy a bit of text to the clipboard on a Touchpad or Pre device , can I programmatically grab that piece of text, or programmatically replace it?
From what I've read in the SDK documents, I assume I'd need a Service to do this. Is this correct?
If so, which service? Are there a list of services available, and/or is there a way to reflect into the framework to see which services are available?
(New to WebOS development, so error on the side of speaking loudly and slowly)
I think you are looking for the getClipboard method on the enyo.dom. However, when I try:
enyo.dom.getClipboard(enyo.bind(this, "gotClipboard"));
gotClipboard: function() {
this.log(JSON.stringify(arguments));
}
I just get {"0",""}, even though I have text in the clipboard. It makes me wonder if this isn't fully baked yet. One argument will be the text in the clipboard when it works.
If I try the companion enyo.dom.setClipboard, I get a NOT_FOUND_ERR: DOM Exception 8.
Found both of these functions in here: https://developer.palm.com/content/api/reference/enyo/enyo-api-reference.html
I would like to accomplish 2 tasks in AIR:
Determine, whether a defined program is running (for example firefox.exe)
If its running, then get the current dimensions of its window - i want to make a screenshot of the window, so i'd need other parameters too i guess: Is it minimized? is it behind some other window?
Is this possible to accomplish in AIR? Im using the latest version (2.6)
No it's not possible out of the box. What you're going to need to do is write a native application in something like C# or C++ and then interface with that application using the NativeProcess API. Here is a video tutorial to something close to what you want to do, and should have you well under way.
http://gotoandlearn.com/play.php?id=125
http://gotoandlearn.com/play.php?id=126