Hans Karlsen (talk | contribs) No edit summary |
Hans Karlsen (talk | contribs) No edit summary |
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In WPF you will need to add code - since the out-of-the-box controls of WPF does not support placeholder texts. | In WPF you will need to add code - since the out-of-the-box controls of WPF does not support placeholder texts. | ||
If you use the MaterialDesign package this code will ge the effect: | If you use the excellent MaterialDesign (MaterialDesignThemes by James Willock) package this code will ge the effect: | ||
<pre> | <pre> |
Revision as of 08:36, 14 October 2022
Placeholder text is text shown as a hint to the user while the control is empty. As soon as the user enters a value the placeholder text is not shown.
The old way was a taggedvalue "Placeholder" along with the desired text to show "Enter a search string..." - this will be deprecated
The new way is to name an additional column with postfix _Placeholder in its name - the result of the expression will be used as a placeholder text.
In Turnkey this has been available since early 2022
In WPF you will need to add code - since the out-of-the-box controls of WPF does not support placeholder texts.
If you use the excellent MaterialDesign (MaterialDesignThemes by James Willock) package this code will ge the effect:
_wecpof = new WECPOFTabBased(); ... _wecpof.OnAddWindow += (s, e) => { e.Win.ViewModelUC.OnViewModelColumnPlacementDone += (s2, e2) => { if (e2.Ctrl is System.Windows.Controls.TextBox || e2.Ctrl is System.Windows.Controls.ComboBox || e2.Ctrl is System.Windows.Controls.DatePicker) { var val = e2.Vcol.TaggedValueLocalAndModelInfo("Placeholder"); if (!string.IsNullOrEmpty(val)) MaterialDesignThemes.Wpf.HintAssist.SetHint(e2.Ctrl, val); var dataForPlaceholder = e2.Vcol.ViewModelClass.ColumnFromName(e2.Vcol.RuntimeName + "_Placeholder"); if (dataForPlaceholder != null) { if (e2.Ctrl is FrameworkElement) { var b = new System.Windows.Data.Binding(dataForPlaceholder.RuntimeName) { Source = e2.Vcol.ViewModelClass.BindingSource, Mode = System.Windows.Data.BindingMode.OneWay /*, Converter = new Eco.Xaml.PassthroughDebugConverter() */ }; (e2.Ctrl as FrameworkElement).SetBinding(MaterialDesignThemes.Wpf.HintAssist.HintProperty, b); } } } };