Helpers and custom templates

ControlHelper

Attached properties the JetPack templates read, so one template serves several looks. Set them in your own styles to recolour a control without copying its template (see the example in Buttons).

Attached property	Type	Read by
`ControlHelper.CornerRadius`	`CornerRadius` (default 2)	buttons, toggle buttons, expander headers
`ControlHelper.MouseOverBackground`	`Brush`	buttons, tiles, split/drop-down buttons, navigation tabs
`ControlHelper.PressedBackground`	`Brush`	buttons, tiles, split/drop-down buttons
`ControlHelper.HighlightBrush`	`Brush`	the 1px top/left highlight on raised surfaces
`ControlHelper.ContentEffect`	`Effect`	effect on the content: embossed or shadowed text
`ControlHelper.EdgeBrush`	`Brush`	dark top/left edge of the dark inputs
`ControlHelper.InnerShadowDark`, `InnerShadowLight`	`Brush`	the two inset lines of inputs
`ControlHelper.ReadOnlyBrush`	`Brush`	overlay on read-only inputs
`ControlHelper.DisabledBrush`	`Brush`	overlay on disabled inputs
`ControlHelper.InputStyle`	`Style`	the text box inside `NumericUpDown`, `TimePicker`, `AutoSuggestBox`
`ControlHelper.HeaderForeground`	`Brush`	tab header text (kept off the `TabItem` so page content does not inherit it)

TextBoxHelper

Member	Type	Description
`Watermark`	attached `string`	Hint shown while empty (`TextBox`, `PasswordBox`, editable `ComboBox`, composite inputs).
`ClearTextButton`	attached `bool`	Shows the × button while there is text.
`HasText`	attached `bool`, read-only	Kept up to date while `IsMonitoring` is on.
`IsMonitoring`	attached `bool`	Tracks text changes and handles `ClearTextCommand`. The JetPack styles turn it on; set it yourself only in a style that does not derive from them.
`ClearTextCommand`	`RoutedUICommand`	Clears the text box it is raised in.

ScrollViewerHelper

Drives the auto-hiding bars of JetPack.Styles.ScrollViewer.Thin (see Lists and data).

Attached property	Type	Description
`AutoHide`	`bool`	Hides the bars until the content scrolls or the mouse moves over the scroll viewer. The thin style turns it on.
`AutoHideDelay`	`TimeSpan` (default 1.5 s)	How long the bars stay after the last scroll or mouse move.
`IsScrollBarActive`	`bool`, read-only	True while the bars should show; always true when `AutoHide` is off. Templates fade the bars on it.

Converters

Key	Class	Converts
`JetPack.Converters.ColorToBrush`	`ColorToBrushConverter`	`Color` → frozen `SolidColorBrush` (and back)
`JetPack.Converters.ColorToHex`	`ColorToHexConverter`	`Color` → `#RRGGBB` / `#AARRGGBB` (and back)

Reusable resources

Key	What
`JetPack.Styles.FocusVisual`	the 1px accent focus ring
`JetPack.Templates.ValidationError`	red frame, folded corner and error call-out
`JetPack.Templates.Button`, `JetPack.Templates.ToggleButton`	the button chrome, driven by `ControlHelper`
`JetPack.Styles.Button.Inline`	small raised button used inside inputs (spinners, picker buttons)
`JetPack.Styles.Button.Clear`	the small × button
`JetPack.Styles.ListBox.Popup`	frameless list for your own drop-downs
`JetPack.Geometry.Check`, `ArrowDown/Up/Left/Right`, `Close`, `Notch`, `ErrorCorner`	glyph geometries

Template parts

When you replace the template of a JetPack control, keep these named parts:

Control	Parts
`JetPackWindow`	`PART_Root` (FrameworkElement, gets the maximised margin), `PART_DialogHost` (Grid, hosts dialogs)
`JetPackDialog`	`PART_Affirmative`, `PART_Negative`, `PART_Close` (Button)
`NumericUpDown`	`PART_TextBox` (TextBox), `PART_Up`, `PART_Down` (ButtonBase)
`SplitButton`	`PART_Arrow` (ToggleButton)
`Flyout`, `InfoBar`	`PART_Close` (Button)
`RangeSlider`	`PART_Track` (Canvas), `PART_Fill` (FrameworkElement), `PART_LowerThumb`, `PART_UpperThumb` (Thumb)
`Rating`	`PART_Host` (Panel; the stars are added to it)
`TimePicker`	`PART_TextBox` (TextBox), `PART_Popup` (Popup), `PART_List` (ListBox)
`ColorPicker`	`PART_Palette` (ListBox)
`AutoSuggestBox`	`PART_TextBox` (TextBox), `PART_Popup` (Popup), `PART_List` (ListBox)
`SearchComboBox`	`PART_TextBox` (TextBox), `PART_Popup` (Popup), `PART_List` (ListBox)
`BusyIndicator`	`PART_Content` (UIElement; blurred while busy)
`JetPackGrid` column header	`PART_FilterButton` (ToggleButton), `PART_FilterPopup` (Popup), `PART_FilterBox` (TextBox). Bind to the header’s column through `jp:JetPackGrid.HeaderColumn`.

The standard WPF controls keep their usual parts (PART_ContentHost, PART_Track, PART_Popup, PART_EditableTextBox, and so on).

Notes for custom styles

Each Controls.*.xaml file is loaded on its own. In your own dictionaries, use DynamicResource for JetPack brushes, and BasedOn="{StaticResource JetPack.Styles...}" only where the JetPack dictionary is already merged above.
WPF’s built-in theme styles still apply under implicit styles. If your template ignores a property the system theme sets (for example Foreground on TreeViewItem), add <Setter Property="OverridesDefaultStyle" Value="True" />.
Implicit styles do not reach subclasses (MyButton : Button). Give the subclass a style BasedOn="{StaticResource JetPack.Styles.Button}", or set its DefaultStyleKey.