I'd like to change the QStyle::PM_TabBarTabHSpace property for a PyQt application. I read the Qt document for QStyle, but I'm not sure how to set this correctly in PyQt.
Non-working code:
style = QStyleFactory.create('Cleanlooks')
style.PM_TabBarTabHSpace = 5 # 5 pixels?
app.setStyle(style)
This code runs, but it doesn't change the padding on the tabbar tabs. I tried using stylesheets to change the tabbar padding, but that ruins the graphics drawing, so that none of the default look-feel stuff gets drawn (I don't want to reimplement all the ui drawing).
I think I might need to use QProxyStyle, but I can't find any examples of how to use this in PyQt4. Edit: It seems that PyQt doesn't have QProxyStyle, as from PyQt4.QtGui import QProxyStyle fails.
Can someone please post an example of changing the value of PM_TabBarTabHSpace? Thanks.
Edit Here is a skeleton code. Changing the PM_TabBarTabHSpace value doesn't do anything. :(
from PyQt4.QtGui import (QApplication, QTabWidget, QWidget,
QStyle, QStyleFactory)
def myPixelMetric(self, option=None, widget=None):
if option == QStyle.PM_TabBarTabHSpace:
return 200 # pixels
else:
return QStyle.pixelMetric(option, widget)
style = QStyleFactory.create('Windows')
style.pixelMetric = myPixelMetric
app = QApplication('test -style Cleanlooks'.split())
# Override style
app.setStyle(style)
tab = QTabWidget()
tab.addTab(QWidget(), 'one')
tab.addTab(QWidget(), 'two')
tab.show()
app.exec_()
QStyle.pixelMetric(...) is built-in class method. You can not set via function pointing. Because, it is in C code. You can test it with adding
def myPixelMetric(self, option=None, widget=None):
print 'Debug, i am calling'
...
in your myPixelmetric function. You need to subclass Style object to achieve this. Here is an example:
class MyStyle(QCommonStyle):
def pixelMetric(self, QStyle_PixelMetric, QStyleOption_option=None, QWidget_widget=None):
if QStyle_PixelMetric == QStyle.PM_TabBarTabHSpace:
return 200
else:
return QCommonStyle.pixelMetric(self, QStyle_PixelMetric, QStyleOption_option, QWidget_widget)
app = QApplication('test -style Cleanlooks'.split())
app.setStyle(MyStyle())
This code snippet will work, but it is ugly. I prefer using stylesheets over manipulating Style.
Related
A Qt packing layout, such as QVBoxLayout, can pack widgets inside it, such as buttons. In this case, they will be packed vertically as shown in image below:
When we pack too many widgets inside such a layout, and since scrolling is not added by default, the buttons will eventually get squeezed onto each other up to a point that they will overlap, as shown below:
My questions are:
How to tell Qt to not show/pack widgets beyond the available viewing space in the non-scrolling layout?
How to handle the case when the window is resized? I.e. Qt should add/remove widgets accordingly. E.g. if there is extra space available, then perhaps Qt should add some extra widgets that it couldn't add previously.
To be specific: "too many packed widgets" is when the widgets start invading spaces of other widgets, including their inter-widget spacings or margins.
Appendix
Images above are generated by this code below as run in a tile in i3, which is a modified version of this.
from PyQt5 import QtCore, QtWidgets
app = QtWidgets.QApplication([])
widget = QtWidgets.QWidget()
layout = QtWidgets.QVBoxLayout(widget)
for i in range(40):
layout.addWidget(QtWidgets.QPushButton(str(i + 1)))
widget.show()
app.exec_()
When too many widgets are packed:
If the window is tiled, you see them overcrowded as in in the image.
If the window is floating, the window will keep growing until it is no longer fully visible in the monitor.
None of these outcomes are acceptable in my case. My goal is to have Qt only pack as much as will be visible, and add/remove/hide/show dynamically as the window gets resized.
Try this code. It does not rely on QVBoxLayout but it basically does the same as this layout. It hides the child widgets which are outside of the area. There are no partially visible widgets.
from PyQt5 import QtWidgets
class Container(QtWidgets.QWidget):
_spacing = 5
def __init__(self, parent=None):
super().__init__(parent)
y = self._spacing
for i in range(40):
button = QtWidgets.QPushButton("Button" + str(i + 1), self)
button.move(self._spacing, y)
y += button.sizeHint().height() + self._spacing
def resizeEvent(self, event):
super().resizeEvent(event)
for child in self.children():
if isinstance(child, QtWidgets.QWidget):
child.resize(self.width() - 2 * self._spacing, child.height())
child.setVisible(child.geometry().bottom() < self.height())
app = QtWidgets.QApplication([])
w = Container()
w.resize(500, 500)
w.show()
app.exec_()
Note that is in fact does not add nor remove widgets dynamically, this would be much more code and it would probably be very depending on your specific use case. Moreover it feels as a premature optimization. Unless you really need it, do not do it.
UPDATE:
I experimented with the code above and proposed some improvements. I especially wanted to make it responsive to changes in child widgets. The problem is that if the child widget changes it size, the parent container must be re-layouted. The code above does not react in any way. To make it responsive, we need to react to LayoutRequest event. Note that in the code below, I have created three types of buttons - one add a line to itself, other increases font size, and yet another decreases font size.
from PyQt5 import QtCore, QtWidgets
def changeFontSize(increment):
font = QtWidgets.QApplication.font()
font.setPointSize(font.pointSize() + increment)
QtWidgets.QApplication.setFont(font)
class Container(QtWidgets.QWidget):
_spacing = 5
_children = [] # maintains the order of creation unlike children()
def __init__(self, parent=None):
super().__init__(parent)
for i in range(100):
child = QtWidgets.QPushButton(self)
child.installEventFilter(self)
# these are just to test various changes in child widget itself to force relayout
r = i % 3
if r == 0:
text = "New line"
onClicked = lambda state, w=child: w.setText(w.text() + "\nclicked")
elif r == 1:
text = "Bigger font"
onClicked = lambda: changeFontSize(1)
elif r == 2:
text = "Smaller font"
onClicked = lambda: changeFontSize(-1)
child.setText(text)
child.clicked.connect(onClicked)
self._children.append(child)
def resizeEvent(self, event):
super().resizeEvent(event)
self._relayout()
def event(self, event):
if event.type() == QtCore.QEvent.LayoutRequest:
self._relayout()
return super().event(event)
def _relayout(self):
y = self._spacing
for child in self._children:
h = child.sizeHint().height()
child.move(self._spacing, y)
child.resize(self.width() - 2 * self._spacing, h)
y += h + self._spacing
child.setVisible(y < self.height())
app = QtWidgets.QApplication([])
w = Container()
w.resize(500, 500)
w.show()
app.exec_()
This code is satisfactory, however it is not perfect. I have observed that when the container is being re-layouted and some of the child widgets will change its visibility state, re-layouting is called again. This is not needed but I have not discovered how to prevent it.
Maybe there is some better way...
I want to use QTextEdit (in read-only mode) to show a clickable hyperlink, I used to do
QTextEdit *textEdit = new QTextEdit;
QTextCursor cursor(textEdit->document());
textEdit->setTextCursor(cursor);
cursor->insertHtml("<a href=\"www.google.com\" >Google</a>");
textEdit->show();
this code will show Google as hyperlink but unable to click.
And if I used
QTextEdit *textEdit = new QTextEdit;
QTextCursor cursor(textEdit->document());
textEdit->setTextCursor(cursor);
QTextCharFormat linkFormat = cursor.charFormat();
linkFormat.setAnchor(true);
linkFormat.setAnchorHref("http://www.google.com");
linkFormat.setAnchorName("Google");
cursor.insertText("Google", linkFormat);
then nothing happen. "Google" is just normal text.
Please help me insert clickable hyperlink to QTextEdit.
Using QTextBrowser is simpler (as suggested by another answer). However, if for some reason you want to use QTextEdit, try to change the text interaction flags using setTextInteractionFlags().
I think you have to enable the Qt::LinksAccessibleByMouse flag.
See Qt::TextInteractionFlag and QTextEdit::textInteractionFlags
To have clickable hyperlink in QTextEdit, you can use
QTextCharFormat::setAnchorHref to set the link for some text
QWidget::mousePressEvent to capture mouse press event
QTextEdit::anchorAt to obtain the link
Here's the minimal working PyQt example,
import sys
from PyQt5.Qt import QDesktopServices, QUrl, QApplication, QColor, Qt
from PyQt5.QtWidgets import QTextEdit
class MyWidget(QTextEdit):
def mousePressEvent(self, e):
self.anchor = self.anchorAt(e.pos())
if self.anchor:
QApplication.setOverrideCursor(Qt.PointingHandCursor)
def mouseReleaseEvent(self, e):
if self.anchor:
QDesktopServices.openUrl(QUrl(self.anchor))
QApplication.setOverrideCursor(Qt.ArrowCursor)
self.anchor = None
app = QApplication(sys.argv)
editor = MyWidget()
cursor = editor.textCursor()
fmt = cursor.charFormat()
fmt.setForeground(QColor('blue'))
address = 'http://example.com'
fmt.setAnchor(True)
fmt.setAnchorHref(address)
fmt.setToolTip(address)
cursor.insertText("Hello world again", fmt)
editor.show()
app.exec_()
As far as I've tried, when using QTextEdit + Qt::LinksAccessibleByMouse I'm able to click on links, but no action is taken (i.e., link is not open). The only action possible is to right-click on the link and select Copy Link Location.
As mentioned, one option is using QTextBrowser. In this case you have to set the QTextBrowser::openExternalLinks property too, in order to open the link using the default browser, otherwise it will be open in the text-browser widget.
Another option, given you have a read-only text, is to use a QLabel with rich format, and using the QLabel::linkActivated signal to open the URL
label->setTextFormat(Qt::RichText);
QObject::connect(label, &QLabel::linkActivated, [](const QString & link) {
QDesktopServices::openUrl(link);
});
You can use QTextBrowser instead of QTextEdit if it read only text.
In order for setTextInteractionFlags() to work the openExternalLinks property needs to be set. Since this property is not available on QTextEdit, here is a little hack to enable it.
auto &clist = edit->children();
for each (QObject *pObj in clist)
{
QString cname = pObj->metaObject()->className();
if (cname == "QWidgetTextControl")
pObj->setProperty("openExternalLinks", true);
}
This does not address the mouse cursor, so you will still need to override mouseMoveEvent.
I'm writing a simple tool menu for Maya, and I'd like to stick it to the border of model panel (perspective).
from PySide import QtCore, QtGui
from maya import OpenMayaUI as omui
from shiboken import wrapInstance
class TestWidget(QtGui.QWidget):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent = self.getMayaWindow())
self.setWindowFlags(QtCore.Qt.Tool | QtCore.Qt.FramelessWindowHint)
self.setFixedSize(100, 100)
panelPtr = omui.MQtUtil.findControl('modelPanel4')
panel = wrapInstance(long(panelPtr), QtGui.QWidget)
position = panel.mapToGlobal(panel.pos())
self.move(position.x(), position.y() + panel.geometry().height() / 2 - self.geometry().height() / 2)
mainLayout = QtGui.QVBoxLayout(self)
button = QtGui.QPushButton('CLOSE')
button.setFixedSize(80, 80)
button.clicked.connect(self.deleteLater)
mainLayout.addWidget(button)
def getMayaWindow(self):
omui.MQtUtil.mainWindow()
ptr = omui.MQtUtil.mainWindow()
return wrapInstance(long(ptr), QtGui.QWidget)
w = TestWidget()
w.show()
The main widget is positioned exactly where I want when it is created (horizontally on the left side of model panel, vertically - in the middle of model panel).
I need to reposition it accordingly when the model panel is resized, but model panel does not emit resized() signal. I'd appreciate any advise.
I've been trying many things to get this working yesterday. I did some additionnal researches today and came to this topic: cgsociety: Creating a floating button inside the viewport
In case of broken link, this is one of the answer:
You can use geometry but there are some issues with triggering
commands based on selection and the undo queue. If you want to go that
route, I would suggest looking into zooHud and zooTriggers (Part of
the zooToolbox)
If you are wanting actual GUI control parented to the viewport, mel
only offers hudslider, hudbutton, and headsUpMessage.
You can also use PyQt and parent in your own custom widgets/layouts or
whatever you want using something like this:
import maya.OpenMayaUI as apiUI import sip
from PyQt4 import QtGui
view = apiUI.M3dView()
apiUI.M3dView.getM3dViewFromModelPanel('modelPanel4', view)
viewWidget = sip.wrapinstance(long(view.widget()), QtCore.QObject)
global myBtn
myBtn = QtGui.QPushButton(viewWidget)
myBtn.setText('testing!')
myBtn.move(100, 100) #Relative to top-left corner of viewport myBtn.show()
You can do anything a full qt widget can do with that, so it's
extremely flexible. but it would require having PyQt installed, which
can be a barrier depending on your tools distribution.
I did a mix of this answer and your code:
from PySide import QtCore, QtGui
from maya import OpenMayaUI as omui
from shiboken import wrapInstance
class CustomQWidget(QtGui.QWidget):
def __init__(self, *args, **kwargs):
QtGui.QWidget.__init__(self, *args, **kwargs)
mainLayout = QtGui.QVBoxLayout(self)
closeButton = QtGui.QPushButton('CLOSE')
closeButton.setFixedSize(80, 40)
closeButton.clicked.connect(self.deleteLater)
helloButton = QtGui.QPushButton('HELLO')
helloButton.setFixedSize(80, 40)
helloButton.clicked.connect(self.printHello)
#Trying to fix glitchy background / Doesn't work, why?
#Is it because layouts don't have background?
p = self.palette()
p.setColor(self.backgroundRole(), QtCore.Qt.red)
self.setPalette(p)
self.setAttribute(QtCore.Qt.WA_StyledBackground, True)
##############################
mainLayout.addWidget(closeButton)
mainLayout.addWidget(helloButton)
def printHello(self):
print "Hello"
view = omui.M3dView()
omui.M3dView.getM3dViewFromModelPanel('modelPanel4', view) #Given the name of a model panel,
#get the M3dView used by that panel. If this fails, then a panel with the given name could not be located.
viewWidget = wrapInstance(long(view.widget()), QtGui.QWidget)
position = viewWidget.mapToGlobal(viewWidget.pos())
w = CustomQWidget(viewWidget)
w.move(0, viewWidget.geometry().height() / 2 - 100 / 2) #Relative to middle-left corner of viewport
w.show()
One of the issue I have it that the background of the widget is glitched:
If anyone knows why and how to fix it, I'll edit my answer with pleasure.
Else, when running this script from Maya's script editor, the widget follows the panel when it is resized.
I did fix such a problem, but not using Python/PyQt.
The problem itself is, that your Qt Widget is there. I have not found a way to make it not paint its background.
My solution was different: I derived from a Qt Layout, pushed all my widgets into that layout and used MQtUtil to get the QWidget of that modelPanel's modelEditor to attach the "real Qt layout" to it.
Heavy caveat that may make Python not suited: Maya doesn't expect "non-Maya" Layouts to be bound to "real-Maya" Widgets like modelEditors. So you need to listen to QEvents and find out when to destroy your layout, so Maya doesn't crash trying.
set autofillbackground True to fix your background painting issue
I have QLabel and this width shrink to content size.
How can I set size policy to grow-only policy?
for example, I set text to "12345" and QLabel should grow to minimal size to show this content, but when I set "12" this wouldnt shrink and stay old size.
Well, unless you don't need to use the space you want to recover for others widgets, you can use a QtGui.QSpacerItem; see QSpacerItem Class Reference.
You can set the size policy to the spacer item.
Note: This gets done automatically when you're using QtDesigner.
In QtDesigner, it should look like this:
The label has a cyan background for ilustrative purposes.
Here, you have some code sample:
Warning: the code has been written in Python. I don't know your lenguage preferences. But the interface is pretty much the same. Goog luck.
import PyQt4.QtGui as gui
import PyQt4.QtCore as core
import sys
if __name__ == "__main__":
app = gui.QApplication(sys.argv)
widget = gui.QWidget(None)
label = gui.QLabel(widget)
label.setStyleSheet("background-color: cyan;")
label.setMinimumWidth(10)
label.setText("Write some text above")
text = gui.QLineEdit(widget)
layout = gui.QVBoxLayout(widget)
hlayout = gui.QHBoxLayout(widget) # This layout will contains
# the label and a sacer item.
layout.addWidget(text)
hlayout.addWidget(label) # Add the label.
# Create the spacer.
spacerItem = gui.QSpacerItem(40, 20, gui.QSizePolicy.Expanding, gui.QSizePolicy.Minimum)
hlayout.addItem(spacerItem) # Add the spacer.
layout.addItem(hlayout)
# Slot for change the text of the label.
#core.pyqtSlot()
def on_textChanged():
label.setText(text.text())
text.textChanged.connect(on_textChanged)
widget.show()
sys.exit(app.exec_())
I'm having an odd problem with a label not being redrawn correctly when the text is changed, when it's inside a QHBoxLayout with an added stretch.
Consider the following (PyQt) example code:
from PyQt5.QtWidgets import QApplication, QHBoxLayout, QWidget, QLabel
from PyQt5.QtCore import QTimer
def clearlabel():
print("clearing")
lbl.setText("")
lbl2.setText("")
app = QApplication([])
# Widget 1: with stretch
w = QWidget()
w.move(0, 0)
w.resize(100, 20)
w.show()
lbl = QLabel()
lbl.setText("foo")
h = QHBoxLayout(w)
h.addStretch()
h.addWidget(lbl)
# Widget 2: without stretch
w2 = QWidget()
w2.move(0, 40)
w2.resize(100, 20)
w2.show()
lbl2 = QLabel()
lbl2.setText("foo")
h2 = QHBoxLayout(w2)
h2.addWidget(lbl2)
QTimer.singleShot(1000, clearlabel)
app.exec_()
Two widgets are shown, one with a QHBoxLayout with a stretch added, one without:
After 2 seconds, a timer sets both label texts from "foo" to an empty string. In the widget without stretch it works like expected - with the one with, however, the label text doesn't get redrawn:
What's going on there? Is this a Qt bug? Am I missing something?
What I found out so far:
This only seems to happen when setting an empty string, setting a shorter string works fine.
However in my real application, it happens without a stretch added as well.
I have now submitted this as QTBUG-36945.
Thanks to the helpful people in the #qt IRC channel (on Freenode), I figured out doing a repaint after setting the text works around the issue:
class Label(QLabel):
...
def setText(self, text):
super().setText(text)
if not text:
self.repaint()
Still I'd be glad to know if I'm just wrong somewhere, or if I should submit a Qt bug.