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Qt SVG : Dynamic Modification

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  • jsulmJ jsulm

    @Parvathy2020 Did you read the documentation from the link I provided?!
    If you need examples here you go: https://doc.qt.io/qt-5/examples-xml.html

    mzimmersM Offline
    mzimmersM Offline
    mzimmers
    wrote on last edited by
    #8

    @jsulm (as long as I'm replying to old topics today...)

    I've got a similar question, best explained through an example. I have a QML TabBar containing several (customized) TabButtons.
    When a given tab is selected, the icon is to be filled in; when not selected, it's to be an outline only.

    The above is easily enough done at the file level by modifying the stroke-opacity field. But, as the OP and you point out, this necessitates file level changes. Impractical, and (I think) impossible when the files are embedded as resources.

    I think the answer to my question is "no," but...is there some way to modify the "properties" (for lack of a better term) of the .svg file programmatically? So I can toggle the fill of my image based on tab selection.

    Thanks for any ideas...

    fcarneyF 1 Reply Last reply
    1
    • mzimmersM mzimmers

      @jsulm (as long as I'm replying to old topics today...)

      I've got a similar question, best explained through an example. I have a QML TabBar containing several (customized) TabButtons.
      When a given tab is selected, the icon is to be filled in; when not selected, it's to be an outline only.

      The above is easily enough done at the file level by modifying the stroke-opacity field. But, as the OP and you point out, this necessitates file level changes. Impractical, and (I think) impossible when the files are embedded as resources.

      I think the answer to my question is "no," but...is there some way to modify the "properties" (for lack of a better term) of the .svg file programmatically? So I can toggle the fill of my image based on tab selection.

      Thanks for any ideas...

      fcarneyF Offline
      fcarneyF Offline
      fcarney
      wrote on last edited by
      #9

      @mzimmers I use Shape for complex dynamic things that can change. It works really well.

      C++ is a perfectly valid school of magic.

      mzimmersM 1 Reply Last reply
      1
      • fcarneyF fcarney

        @mzimmers I use Shape for complex dynamic things that can change. It works really well.

        mzimmersM Offline
        mzimmersM Offline
        mzimmers
        wrote on last edited by
        #10

        @fcarney in this case, I'm given .svg files from the UX team. I'd have to translate them into QML Shapes, which I suppose isn't terrible, but being the creatively lazy guy I am, I'm hoping for something more straightforward.

        fcarneyF JKSHJ 3 Replies Last reply
        0
        • mzimmersM mzimmers

          @fcarney in this case, I'm given .svg files from the UX team. I'd have to translate them into QML Shapes, which I suppose isn't terrible, but being the creatively lazy guy I am, I'm hoping for something more straightforward.

          fcarneyF Offline
          fcarneyF Offline
          fcarney
          wrote on last edited by
          #11

          @mzimmers Ah, yeah, that sucks.

          C++ is a perfectly valid school of magic.

          1 Reply Last reply
          0
          • mzimmersM mzimmers

            @fcarney in this case, I'm given .svg files from the UX team. I'd have to translate them into QML Shapes, which I suppose isn't terrible, but being the creatively lazy guy I am, I'm hoping for something more straightforward.

            fcarneyF Offline
            fcarneyF Offline
            fcarney
            wrote on last edited by
            #12

            @mzimmers Maybe you can do something with PathSVG. I played with this a bit for my own stuff. Might be able to pick apart the file and color each the way you want.

            C++ is a perfectly valid school of magic.

            1 Reply Last reply
            1
            • mzimmersM Offline
              mzimmersM Offline
              mzimmers
              wrote on last edited by
              #13

              @fcarney that's definitely on the right track. Looks like I need to find (or write) a .svg to Qt Path converter.

              1 Reply Last reply
              0
              • mzimmersM mzimmers

                @fcarney in this case, I'm given .svg files from the UX team. I'd have to translate them into QML Shapes, which I suppose isn't terrible, but being the creatively lazy guy I am, I'm hoping for something more straightforward.

                JKSHJ Offline
                JKSHJ Offline
                JKSH
                Moderators
                wrote on last edited by
                #14

                @mzimmers said in Qt SVG : Dynamic Modification:

                this necessitates file level changes. Impractical, and (I think) impossible when the files are embedded as resources.

                You could do string replacements and pass the final document to an Image as a Data URL:

                Window {
                    width: 640
                    height: 480
                    visible: true
                
                    property string svgStr: `<svg xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="50" fill="${colours.currentText}"/></svg>`
                
                    ComboBox {
                        id: colours
                        model: ["red", "green", "blue"]
                    }
                
                    Image {
                        anchors.centerIn: parent
                        source: `data:image/svg+xml;base64,${Qt.btoa(svgStr)}`
                        sourceSize.width: 300
                        sourceSize.height: 300
                    }
                }
                

                Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                mzimmersM 1 Reply Last reply
                1
                • JKSHJ JKSH

                  @mzimmers said in Qt SVG : Dynamic Modification:

                  this necessitates file level changes. Impractical, and (I think) impossible when the files are embedded as resources.

                  You could do string replacements and pass the final document to an Image as a Data URL:

                  Window {
                      width: 640
                      height: 480
                      visible: true
                  
                      property string svgStr: `<svg xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="50" fill="${colours.currentText}"/></svg>`
                  
                      ComboBox {
                          id: colours
                          model: ["red", "green", "blue"]
                      }
                  
                      Image {
                          anchors.centerIn: parent
                          source: `data:image/svg+xml;base64,${Qt.btoa(svgStr)}`
                          sourceSize.width: 300
                          sourceSize.height: 300
                      }
                  }
                  
                  mzimmersM Offline
                  mzimmersM Offline
                  mzimmers
                  wrote on last edited by
                  #15

                  @JKSH this is probably the way to go for most cases, and (I imagine) solves the OP's question. (I'll need to build around this, as I'm currently using the icon property of TabButton.)

                  @fcarney @JKSH this has been educational; thanks.

                  L JKSHJ 2 Replies Last reply
                  0
                  • mzimmersM mzimmers

                    @JKSH this is probably the way to go for most cases, and (I imagine) solves the OP's question. (I'll need to build around this, as I'm currently using the icon property of TabButton.)

                    @fcarney @JKSH this has been educational; thanks.

                    L Offline
                    L Offline
                    lemons
                    wrote on last edited by
                    #16

                    @mzimmers if it is only for icons, did you think about simply converting them into a ligature font (named icons). This way you can use the icons as font in a QML Text element.

                    Text {
                        font.family: "myLigatureFontName" // e.g. FontAwesome Pro
                        font.pointSize: 32
                        text: "myLigatureIconName" // e.g. "home" for a house-icon
                        color: "transparent" // font color
                        style: Text.Outline  // if you need outline
                        styleColor: "red"    // outline color
                    }
                    
                    1 Reply Last reply
                    1
                    • mzimmersM mzimmers

                      @JKSH this is probably the way to go for most cases, and (I imagine) solves the OP's question. (I'll need to build around this, as I'm currently using the icon property of TabButton.)

                      @fcarney @JKSH this has been educational; thanks.

                      JKSHJ Offline
                      JKSHJ Offline
                      JKSH
                      Moderators
                      wrote on last edited by
                      #17

                      @mzimmers said in Qt SVG : Dynamic Modification:

                      (I'll need to build around this, as I'm currently using the icon property of TabButton.)

                      @fcarney @JKSH this has been educational; thanks.

                      You're welcome.

                      Works for button icons too!

                      TabButton {
                          text: "Click Me"
                          icon.source: `data:image/svg+xml;base64,${Qt.btoa(svgStr)}`
                      }
                      

                      Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                      1 Reply Last reply
                      1

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