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Issue with QPushButton text horizontal clipping

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  • A ajaxcrypto

    But how do I figure out the required max height/width? For that the logic is

    1. Parse and resolve all stylesheet
    2. Figure out the largest dimensions based on font-size and font-weight
    3. Resize the button accordingly.

    Step 2 would require like looping through all the selector/combinators applied to the button and figuring out the largest font size and weight

    mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by
    #17

    @ajaxcrypto
    QStyle respect stylesheets.
    So i would not look at the stylesheet as text but when its been processed by Qt.
    At the moment of painting.
    That would be in the QStyleOptionButton.
    So with a little luck, you can make button check the actual text size and
    adjust if needed.

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    • A Offline
      A Offline
      ajaxcrypto
      wrote on last edited by
      #18

      This fiddle nicely demonstrates what I wanted to acheive with QPushButton

      https://jsfiddle.net/h7fkj5ow/

      mrjjM 1 Reply Last reply
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      • A Offline
        A Offline
        ajaxcrypto
        wrote on last edited by
        #19

        Tried fiddling with style option, does not work, in most cases, even the intial text gets clipped horizontally, on hover, clips even more... So basically an auto expanding button which fits to its content is simply not possible without writing a complete QSS parsing system?

        Why doesn't Qt expose the parser API ? It would have saved me days worth of work... Like maybe changing a single property for :hover selector based on some condition for a QPushButton i.e.

        button->setStyleProperty("hover", "background-color", Qt::white);

        mrjjM 1 Reply Last reply
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        • A ajaxcrypto

          This fiddle nicely demonstrates what I wanted to acheive with QPushButton

          https://jsfiddle.net/h7fkj5ow/

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #20

          @ajaxcrypto
          Hi
          I understand it. but none of the widgets will grow to fit text.

          Sadly, it seems the QStyleOptionButton do not reflect the new
          font size set by hover. It reports width as same so my idea was not as straight as i had hoped.
          It should be in there some where.

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          • A ajaxcrypto

            Tried fiddling with style option, does not work, in most cases, even the intial text gets clipped horizontally, on hover, clips even more... So basically an auto expanding button which fits to its content is simply not possible without writing a complete QSS parsing system?

            Why doesn't Qt expose the parser API ? It would have saved me days worth of work... Like maybe changing a single property for :hover selector based on some condition for a QPushButton i.e.

            button->setStyleProperty("hover", "background-color", Qt::white);

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #21

            @ajaxcrypto
            Hi
            They consider the parser private.
            I also dreamed of an API so colors etc could be read from stylesheet alone.

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            • A Offline
              A Offline
              ajaxcrypto
              wrote on last edited by
              #22

              So basically I have to roll my own QSS parser, keep track of all relevant styles and then paint widgets accordingly for auto-resizing widgets based on current properties... Sigh
              Might as well write my own GUI library at this stage using primitives + signal/slots...

              Note: I could not find any documentation as to where selector specific style information is stored, neither are there public/protected member functions to get them.

              mrjjM 1 Reply Last reply
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              • A ajaxcrypto

                So basically I have to roll my own QSS parser, keep track of all relevant styles and then paint widgets accordingly for auto-resizing widgets based on current properties... Sigh
                Might as well write my own GUI library at this stage using primitives + signal/slots...

                Note: I could not find any documentation as to where selector specific style information is stored, neither are there public/protected member functions to get them.

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #23

                @ajaxcrypto
                Parsing stylesheet would be my last attempt.
                QStyle, QProxyStyle and friends provides many ways to alter
                how stylesheets are used.

                My idea with QStyleOptionButton almost worked except I cant find where the
                hover font size is stored. Not even the font for painter seems to change which i find a bit odd.
                (update: my idea with QStyleOptionButton cannot be used. not reflected. sorry)

                Before you go down the long and evil road, give it some days and see if someone has a good idea
                on how to do it without parsing the actual stylesheet.

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #24

                  What about using the QEvent::HoverEnter and QEvent::HoverLeave events to modify the font ?
                  You could also use QFontMetrics to calculate the minimum size needed to fit the text in the button.

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • A Offline
                    A Offline
                    ajaxcrypto
                    wrote on last edited by
                    #25

                    There are other selectors as well like :pressed, so I have to do this for all of them and their combinations when set with property value i.e.

                    QPushButton[prop="value"]:hover { ... }
                    QPushButton[prop="other"]:hover { ... }

                    I wanted a generic solution which works for all kinds of stylesheet, not a particular stylesheet.

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                    • JonBJ Offline
                      JonBJ Offline
                      JonB
                      wrote on last edited by JonB
                      #26

                      @ajaxcrypto

                      [ASIDE: All this stuff about parsing stylesheets, that's what I was talking about in https://forum.qt.io/topic/85184/undoing-an-added-setstylesheet-property, wanting individual properties to be accessible. But that's how it is at present. You cannot access specific selectors.]

                      You probably won't thank me for this comment. I don't know what your application is all about. But do you really have a requirement to support anyone making any arbitrary changes they fancy to buttons in the stylesheet and then having to ensure that whatever fits in the button? Then it seems likely you'll want to allow arbitrary styling of any element, so sorting out the dynamic sizing of a button will only be the start of what you'll face? Is the amount of effort required worth it for the return? My 2 cents.

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                      • A Offline
                        A Offline
                        ajaxcrypto
                        wrote on last edited by
                        #27

                        @JNBarchan Style sheets are not completely arbitrary, but the code I am writing is more of a library which will be used in multiple applications (not tied to any particular application), so yes, I have very limited control over what kind of style sheets I will get.

                        JonBJ 1 Reply Last reply
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                        • A ajaxcrypto

                          @JNBarchan Style sheets are not completely arbitrary, but the code I am writing is more of a library which will be used in multiple applications (not tied to any particular application), so yes, I have very limited control over what kind of style sheets I will get.

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by
                          #28

                          @ajaxcrypto
                          What about the practicality that button font size is only the start, presumably you want to allow loads of other widgets/layouts to be alterable?

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                          • A Offline
                            A Offline
                            ajaxcrypto
                            wrote on last edited by
                            #29

                            Note that what I asked here is merely a single example of a property, but is mostly limited to colors, borders and font properties. I already have some custom widgets (about a dozen) of them ready, so yes, direct access to properties from style sheet would be great. The number of widgets which I want this on is however quite limited (not arbitrary). The bunch of applications will have some common feel and some feel unique to themselves (like a family).

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                            • A Offline
                              A Offline
                              ajaxcrypto
                              wrote on last edited by
                              #30

                              Thank you everyone! I think I understand the challenges of implementing the feature set I need. I may pursue either parsing or have style sheet templates (if at all possible). For now, will focus on other things instead. Should I keep this thread "Unsolved"?

                              mrjjM 1 Reply Last reply
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                              • A ajaxcrypto

                                Thank you everyone! I think I understand the challenges of implementing the feature set I need. I may pursue either parsing or have style sheet templates (if at all possible). For now, will focus on other things instead. Should I keep this thread "Unsolved"?

                                mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on last edited by
                                #31

                                @ajaxcrypto
                                Hi leave open a bit, some are in other time zones so not all hope is lost yet :)

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