Qt font size stylesheet

The QFont class specifies a font used for drawing text. Note: All functions in this class are reentrant. When you create a QFont object you specify various attributes that you want the font to have. Qt will use the font with the specified attributes, or if no matching font exists, Qt will use the closest matching installed font. The attributes of the font that is actually used are retrievable from a QFontInfo object.

If the window system provides an exact match exactMatch returns true.

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Use QFontMetrics to get measurements, e. Note that a QApplication instance must exist before a QFont can be used. You can set the application's default font with QApplication::setFont.

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If a chosen font does not include all the characters that need to be displayed, QFont will try to find the characters in the nearest equivalent fonts.

When a QPainter draws a character from a font the QFont will report whether or not it has the character; if it does not, QPainter will draw an unfilled square. The attributes set in the constructor can also be set later, e. The remaining attributes must be set after contstruction, e.

qt font size stylesheet

QFontInfo objects should be created after the font's attributes have been set. A QFontInfo object will not change, even if you change the font's attributes.

The corresponding "get" functions, e. The actual values are available from a QFontInfo object. The default family corresponding to the current style hint is returned by defaultFamily. The font-matching algorithm has a lastResortFamily and lastResortFont in cases where a suitable match cannot be found. You can provide substitutions for font family names using insertSubstitution and insertSubstitutions. Substitutions can be removed with removeSubstitution. Use substitute to retrieve a family's first substitute, or the family name itself if it has no substitutes.

Use substitutes to retrieve a list of a family's substitutes which may be empty. Every QFont has a key which you can use, for example, as the key in a cache or dictionary. If you want to store a user's font preferences you could use QSettingswriting the font information with toString and reading it back with fromString. It is possible to set the height of characters shown on the screen to a specified number of pixels with setPixelSize ; however using setPointSize has a similar effect and provides device independence.

In X11 you can set a font using its system specific name with setRawName. Loading fonts can be expensive, especially on X QFont contains extensive optimizations to make the copying of QFont objects fast, and to cache the results of the slow window system functions it depends upon. In Windows a request for the "Courier" font is automatically changed to "Courier New", an improved version of Courier that allows for smooth scaling. The older "Courier" bitmap font can be selected by setting the PreferBitmap style strategy see setStyleStrategy.

If you have a font which matches on family, even if none of the other attributes match, this font will be chosen in preference to a font which doesn't match on family but which does match on the other attributes. This is because font family is the dominant search criteria.Your browser does not seem to support JavaScript.

As a result, your viewing experience will be diminished, and you may not be able to execute some actions. Please download a browser that supports JavaScript, or enable it if it's disabled i. Now I want to manipulate this button as follows: 1- Change the font to Italic or Bold e. Thank you. It worked now.

Qt Style Sheets Reference

But what for: Positioning and the color of font? Do we have such facilities? Color was used but about positioning a button not yet!

I fount this using your link. It appears to be what I need. But how to use it? I tried some ways using the contents of the page but no result. I also looked at it. It's about Designerwhich widgets can be customized in property window coding seems useless.

Usually for positioning : buttons,widgets ,i am using Layouti never used position property of stylesheet not with stylesheet,i do you have a layout on your application? And yes widgets can be customized from qt Designeron your mainWindowon stylesheet property.

When you add widgets with gridLayout you choose the rowthe columnthe row span and column span, and the alignement. Qt Forum. How to set size and font for a QPushbutton This topic has been deleted. Only users with topic management privileges can see it.

Reply Quote 0 1 Reply Last reply. Reply Quote 2 1 Reply Last reply. I looked at this link but couldn't find useful method for the tasks I mentioned. Reply Quote 1 1 Reply Last reply.

Reply Quote 3 1 Reply Last reply. If you are using Qt Designer positions of buttons can be changed directly with drag and drop And yes widgets can be customized from qt Designeron your mainWindowon stylesheet property.

Thank you for the time you considered to help me. I'm appreciative. Loading More Posts 14 Posts. Reply Reply as topic.It handles widget specific initialization, finalization. For any GUI application using Qt, there is precisely one QApplication object, no matter whether the application has 0, 1, 2 or more windows at any given time. Some GUI applications provide a special batch mode ie. In such non-GUI mode, it is often sufficient to instantiate a plain QCoreApplication to avoid unnecessarily initializing resources needed for a graphical user interface.

The following example shows how to dynamically create an appropriate type of application instance:. The QApplication object is accessible through the instance function that returns a pointer equivalent to the global qApp pointer.

Since the QApplication object does so much initialization, it must be created before any other objects related to the user interface are created. QApplication also deals with common command line arguments. Hence, it is usually a good idea to create it before any interpretation or modification of argv is done in the application itself. Set this property to true to automatically display the SIP when entering widgets that accept keyboard input.

The flash time is the time required to display, invert and restore the caret display. Usually the text cursor is displayed for half the cursor flash time, then hidden for the same amount of time, but this may vary. The default value on X11 is milliseconds. On Windows, the Control Panel value is used and setting this property sets the cursor flash time for all applications. We recommend that widgets do not cache this value as it may change at any time if the user changes the global desktop settings.

Note: This property may hold a negative value, for instance if cursor blinking is disabled. This property holds the time limit in milliseconds that distinguishes a double click from two consecutive mouse clicks.

On Windows and Mac OS, the operating system's value is used. This property holds the minimum size that any GUI element that the user can interact with should have. For example, no button should be resized to be smaller than the global strut size. By default, this property contains a QSize object with zero width and height. This property holds the time limit in milliseconds that distinguishes a key press from two consecutive key presses. If you support drag and drop in your application, and want to start a drag and drop operation after the user has moved the cursor a certain distance with a button held down, you should use this property's value as the minimum distance required.

For example, if the mouse position of the click is stored in startPos and the current position e. This property holds the time in milliseconds that a mouse button must be held down before a drag and drop operation will begin. If you support drag and drop in your application, and want to start a drag and drop operation after the user has held down a mouse button for a certain amount of time, you should use this property's value as the delay.

Qt also uses this delay internally, e.Qt Style Sheets support various properties, pseudo-states, and subcontrols that make it possible to customize the look of widgets.

Setting the background-attachment to fixed provides a background-image that does not scroll with the viewport.

qt font size stylesheet

Setting the background-attachment to scrollscrolls the background-image when the scroll bars move. The spacing property specifies the spacing between the check indicator and the text.

See Customizing QCheckBox for an example. See Customizing QComboBox for an example. The dock widget border can be styled using the border property. The ::title subcontrol can be used to customize the title bar. The close and float buttons are positioned with respect to the ::title subcontrol using the ::close-button and ::float-button respectively. When the title bar is vertical, the :vertical pseudo class is set. In addition, depending on QDockWidget::DockWidgetFeaturethe :closable:floatable and :movable pseudo states are set.

Warning: The style sheet has no effect when the QDockWidget is undocked as Qt uses native top level windows when undocked. See Customizing QDockWidget for an example. Since 4.

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In the case of a checkable QGroupBoxthe title includes the check indicator. The indicator is styled using the the ::indicator subcontrol. The spacing property can be used to control the spacing between the text and indicator. See Customizing QGroupBox for an example. Sort indicator in can be styled using the ::up-arrow and the ::down-arrow Sub-control. See Customizing QHeaderView for an example. The color and background of the selected item is styled using selection-color and selection-background-color respectively.

The password character can be styled using the lineedit-password-character property. See Customizing QLineEdit for an example. The selection behavior is controlled by the show-decoration-selected property. Use the ::item subcontrol for more fine grained control over the items in the QListView.

See QAbsractScrollArea to style scrollable backgrounds. See Customzing QListView for an example. See Customizing QMainWindow for an example.

Individual items are styled using the ::item subcontrol. In addition to the usually supported pseudo states, item subcontrol supports the :selected:default:exclusive and the non-exclusive pseudo states. The indicator of checkable menu items is styled using the ::indicator subcontrol.

The separator is styled using the ::separator subcontrol. For items with a sub menu, the arrow marks are styled using the right-arrow and left-arrow.Qt Designer Integration. Qt Style Sheets Reference. This could be achieved like this:. If we want the property to apply only to the QLineEdit s that are children or grandchildren or grand-grandchildren of a specific dialog, we would rather do this:.

Alternatively, we can set the background-color property directly on the QLineEditomitting the selector:. There are many situations where we need to present a form that has mandatory fields. To indicate to the user that the field is mandatory, one effective albeit esthetically dubious solution is to use yellow as the background color for those fields. It turns out this is very easy to implement using Qt Style Sheets.

First, we would use the following application-wide style sheet:. This means that every widget whose mandatoryField Qt property is set to true would have a yellow background.

Font size change when resize QTreeView/QTreeWidget with stylesheet on QApplication

Then, for each mandatory field widget, we would simply create a mandatoryField property on the fly and set it to true. For example:. This time, we will show how to create a red QPushButton. This QPushButton would presumably be connected to a very destructive piece of code. We have made a request that cannot be satisfied using the native styles alone e. Things look already a lot better.

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But the button looks a bit cramped. Additionally, we will enforce a minimum width, round the corners, and specify a larger font to make the button look nicer:. We can fix this by specifying a slightly different background color and use a different border style. Subcontrols give access to the sub-elements of a widget.

For example, a QPushButton associated with a menu using setMenu has a menu indicator.

qt font size stylesheet

By default, the menu indicator is located at the bottom-right corner of the padding rectangle. We can change this by specifying subcontrol-position and subcontrol-origin to anchor the indicator differently. We can also use top and left to move the indicator by a few pixels. This positions the myindicator. However, we would like to give a visual indication that a QLineEdit is read-only by making it appear gray:.Qt Style Sheets Reference. Let's start by setting yellow as the background color of all QLineEdit s in an application.

This could be achieved like this:. If we want the property to apply only to the QLineEdit s that are children or grandchildren or grand-grandchildren of a specific dialog, we would rather do this:. Alternatively, we can set the background-color property directly on the QLineEditomitting the selector:. There are many situations where we need to present a form that has mandatory fields. To indicate to the user that the field is mandatory, one effective albeit esthetically dubious solution is to use yellow as the background color for those fields.

It turns out this is very easy to implement using Qt Style Sheets. First, we would use the following application-wide style sheet:. This means that every widget whose mandatoryField Qt property is set to true would have a yellow background. Then, for each mandatory field widget, we would simply create a mandatoryField property on the fly and set it to true.

For example:. This time, we will show how to create a red QPushButton.

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This QPushButton would presumably be connected to a very destructive piece of code. Things look already a lot better. But the button looks a bit cramped. Let's specify some spacing between the border and the text using the padding. Additionally, we will enforce a minimum width, round the corners, and specify a larger font to make the button look nicer:. The only issue remaining is that the button doesn't react when we press it.

We can fix this by specifying a slightly different background color and use a different border style. Subcontrols give access to the sub-elements of a widget. Let's customize the menu indicator for the red push button:. By default, the menu indicator is located at the bottom-right corner of the padding rectangle.

We can change this by specifying subcontrol-position and subcontrol-origin to anchor the indicator differently. We can also use top and left to move the indicator by a few pixels. This positions the myindicator. Since red seems to be our favorite color, let's make the text in QLineEdit red by setting the following application-wide stylesheet:.

However, we would like to give a visual indication that a QLineEdit is read-only by making it appear gray:. At some point, our design team comes with the requirement that all QLineEdit s in the registration form with the object name registrationDialog to be brown:.

For example, to set a background-image that scrolls with the scroll bar:. The main difference is that a tristate QCheckBox has an indeterminate state. We will look at an example where the drop down button of a QComboBox appears "merged" with the combo box frame.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

Problem here is: I can not set font size directly for the content because at the moment I set, the content does not appear yet. This is my code:. This is the result, the header font size is changed but the content is not. Where was I wrong, or do you have any other solutions for that? Theoretically you can adjust the content in QTreeWidget::item stylesheet subcontrol, but Qt ignored font-size in this case and I don't know why.

Learn more. Asked 3 years, 3 months ago. Active 3 years, 3 months ago. Viewed 3k times. I try to set new font size for header and content of a tree widget. Active Oldest Votes. Alternatively you can adjust font size of content area in next way: ui. But this way does not work.

Qt Documentation

I tried this way before already. Because the moment we set font, there is nothing as content of tree widget, so this code has no effect. How you added the content? I also use addTopLevelItem. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. The Overflow How many jobs can be done at home? Featured on Meta. Community and Moderator guidelines for escalating issues via new response….

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