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contstyle: content styling supported by new htmlcore WidgetHandlers #1614

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Merged
kkoreilly merged 5 commits into from
Sep 9, 2025
Merged

contstyle: content styling supported by new htmlcore WidgetHandlers #1614

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767f367
contstyle: content styling supported by htmlcore WidgetHandlers -- ke…
rcoreilly Sep 9, 2025
873b1e2
do image double-click in new handler -- obviates 1612 contimage
rcoreilly Sep 9, 2025
7b90c51
Merge branch 'main' into contstyle
rcoreilly Sep 9, 2025
f57e0e3
contstyle: fix order of widget handler appliction
rcoreilly Sep 9, 2025
9dd77ef
htmlcore: sequential order docs
kkoreilly Sep 9, 2025
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19 changes: 19 additions & 0 deletions content/content.go
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@ import (
"cogentcore.org/core/htmlcore"
"cogentcore.org/core/math32"
"cogentcore.org/core/styles"
"cogentcore.org/core/styles/abilities"
"cogentcore.org/core/styles/units"
"cogentcore.org/core/system"
"cogentcore.org/core/text/csl"
Expand Down Expand Up @@ -186,6 +187,24 @@ func (ct *Content) Init() {
}
return false
}
ct.Context.AddWidgetHandler(func(w core.Widget) {
switch x := w.(type) {
case *core.Text:
x.Styler(func(s *styles.Style) {
s.Max.X.Ch(120)
})
case *core.Image:
x.Styler(func(s *styles.Style) {
s.SetAbilities(true, abilities.Clickable, abilities.DoubleClickable)
s.Overflow.Set(styles.OverflowAuto)
})
x.OnDoubleClick(func(e events.Event) {
d := core.NewBody("Image")
core.NewImage(d).SetImage(x.Image)
d.RunWindowDialog(x)
})
}
})

ct.Maker(func(p *tree.Plan) {
if ct.currentPage == nil {
Expand Down
21 changes: 21 additions & 0 deletions htmlcore/context.go
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,13 @@ type Context struct {
// will not be generated.
AttributeHandlers map[string]func(ctx *Context, w io.Writer, node ast.Node, entering bool, tag, value string) bool

// WidgetHandlers is a list of handler functions for each Widget,
// called in sequential order for each widget that is created,
// after it has been configured by the existing handlers etc.
// This allows for additional styling to be applied based on the
// type of widget, for example.
WidgetHandlers []func(w core.Widget)

// firstRow indicates the start of a table, where number of columns is counted.
firstRow bool
}
Expand Down Expand Up @@ -168,6 +175,7 @@ func (c *Context) config(w core.Widget) {
}
}
})
c.handleWidget(w)
}

// InlineParent returns the current parent widget that inline
Expand Down Expand Up @@ -244,3 +252,16 @@ func (c *Context) LinkButtonUpdating(bt *core.Button, url func() string) *core.B
})
return bt
}

// AddWidgetHandler adds given widget handler function
func (c *Context) AddWidgetHandler(f func(w core.Widget)) {
c.WidgetHandlers = append(c.WidgetHandlers, f)
}

// handleWidget calls WidgetHandlers functions on given widget,
// in order added so last one has override priority.
func (c *Context) handleWidget(w core.Widget) {
for _, f := range c.WidgetHandlers {
f(w)
}
}
12 changes: 11 additions & 1 deletion htmlcore/examples/md/md.go
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ import (
"cogentcore.org/core/base/errors"
"cogentcore.org/core/core"
"cogentcore.org/core/htmlcore"
"cogentcore.org/core/styles"
_ "cogentcore.org/core/text/tex" // include this to get math
)

Expand All @@ -18,6 +19,15 @@ var content string

func main() {
b := core.NewBody("MD Example")
errors.Log(htmlcore.ReadMDString(htmlcore.NewContext(), b, content))
ctx := htmlcore.NewContext()
ctx.AddWidgetHandler(func(w core.Widget) {
switch x := w.(type) {
case *core.Text:
x.Styler(func(s *styles.Style) {
s.Max.X.Ch(80)
})
}
})
errors.Log(htmlcore.ReadMDString(ctx, b, content))
b.RunMainWindow()
}
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