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// Copyright 2017 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package walk
import (
"github.com/lxn/win"
)
var ValidationErrorEffect WidgetGraphicsEffect
type ToolTipErrorPresenter struct {
toolTip *ToolTip
curWidget Widget
widget2error map[Widget]error
trackedBoundsChangedHandles map[Window]int
form Form
formActivatingHandle int
formDeactivatingHandle int
}
func NewToolTipErrorPresenter() (*ToolTipErrorPresenter, error) {
tt, err := newToolTip(win.TTS_BALLOON)
if err != nil {
return nil, err
}
succeeded := false
defer func() {
if !succeeded {
tt.Dispose()
}
}()
succeeded = true
return &ToolTipErrorPresenter{
toolTip: tt,
widget2error: make(map[Widget]error),
trackedBoundsChangedHandles: make(map[Window]int),
formActivatingHandle: -1,
formDeactivatingHandle: -1,
}, nil
}
func (ttep *ToolTipErrorPresenter) Dispose() {
if ttep.toolTip != nil {
ttep.untrack()
ttep.toolTip.Dispose()
ttep.toolTip = nil
if ttep.form != nil {
ttep.form.AsFormBase().activatingPublisher.event.Detach(ttep.formActivatingHandle)
ttep.form.AsFormBase().deactivatingPublisher.event.Detach(ttep.formDeactivatingHandle)
ttep.form = nil
}
}
}
func (ttep *ToolTipErrorPresenter) PresentError(err error, widget Widget) {
if ttep.toolTip == nil {
return
}
if err == nil && widget == ttep.curWidget {
ttep.untrack()
}
if err == nil {
ttep.toolTip.RemoveTool(widget)
delete(ttep.widget2error, widget)
} else {
ttep.toolTip.addTrackedTool(widget)
ttep.widget2error[widget] = err
}
var found bool
if widget != nil {
walkDescendants(widget.Form().AsFormBase().clientComposite, func(w Window) bool {
wt := w.(Widget)
if !found {
if e, ok := ttep.widget2error[wt]; ok {
err, widget, found = e, wt, true
}
}
if !found && wt == ttep.curWidget || wt != widget || err == nil {
wt.GraphicsEffects().Remove(ValidationErrorEffect)
}
return true
})
}
if found {
if widget != ttep.curWidget {
ttep.untrack()
}
if ve, ok := err.(*ValidationError); ok {
ttep.toolTip.SetErrorTitle(ve.title)
ttep.toolTip.SetText(widget, ve.message)
} else {
ttep.toolTip.SetErrorTitle(tr("Invalid Input"))
ttep.toolTip.SetText(widget, err.Error())
}
if widget != ttep.curWidget {
ttep.track(widget)
if effects := widget.GraphicsEffects(); !effects.Contains(ValidationErrorEffect) {
effects.Add(ValidationErrorEffect)
}
}
}
}
func (ttep *ToolTipErrorPresenter) track(widget Widget) {
var wnd Window
wnd = widget
for wnd != nil {
handle := wnd.AsWindowBase().boundsChangedPublisher.event.Attach(func() {
ttep.toolTip.track(widget)
})
ttep.trackedBoundsChangedHandles[wnd] = handle
if ttep.form == nil {
ttep.form = widget.Form()
ttep.formActivatingHandle = ttep.form.AsFormBase().activatingPublisher.event.Attach(func() {
ttep.toolTip.track(widget)
})
ttep.formDeactivatingHandle = ttep.form.AsFormBase().deactivatingPublisher.event.Attach(func() {
ttep.toolTip.track(widget)
})
}
if w, ok := wnd.(Widget); ok {
if parent := w.Parent(); parent != nil {
wnd = parent
}
} else {
break
}
}
ttep.toolTip.track(widget)
ttep.curWidget = widget
}
func (ttep *ToolTipErrorPresenter) untrack() {
if ttep.curWidget == nil {
return
}
ttep.toolTip.untrack(ttep.curWidget)
for wnd, handle := range ttep.trackedBoundsChangedHandles {
wnd.AsWindowBase().boundsChangedPublisher.event.Detach(handle)
delete(ttep.trackedBoundsChangedHandles, wnd)
}
ttep.curWidget = nil
}
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