Nested widget to display and control a scrollbar in a window. More...

#include <widget_type.h>

Inheritance diagram for NWidgetScrollbar:

Public Member Functions
	NWidgetScrollbar (WidgetType tp, Colours colour, WidgetID index)
	Scrollbar widget.

void	SetupSmallestSize (Window *w) override
	Compute smallest size needed by the widget.

void	Draw (const Window *w) override
	Draw the widgets of the tree.

Public Member Functions inherited from NWidgetCore
	NWidgetCore (WidgetType tp, Colours colour, WidgetID index, uint fill_x, uint fill_y, uint32_t widget_data, StringID tool_tip)
	Initialization of a 'real' widget.

void	SetDataTip (uint32_t widget_data, StringID tool_tip)
	Set data and tool tip of the nested widget.

void	SetToolTip (StringID tool_tip)
	Set the tool tip of the nested widget.

void	SetTextStyle (TextColour colour, FontSize size)
	Set the text style of the nested widget.

void	SetAlignment (StringAlignment align)
	Set the text/image alignment of the nested widget.

void	SetLowered (bool lowered)
	Lower or raise the widget.

bool	IsLowered () const
	Return whether the widget is lowered.

void	SetDisabled (bool disabled)
	Disable (grey-out) or enable the widget.

bool	IsDisabled () const
	Return whether the widget is disabled.

void	FillWidgetLookup (WidgetLookup &widget_lookup) override
	Fill the Window::widget_lookup with pointers to nested widgets in the tree.

NWidgetCore *	GetWidgetFromPos (int x, int y) override
	Retrieve a widget by its position.

bool	IsHighlighted () const override
	Return whether the widget is highlighted.

TextColour	GetHighlightColour () const override
	Return the colour of the highlight.

void	SetHighlighted (TextColour highlight_colour) override
	Highlight the widget or not.

Public Member Functions inherited from NWidgetResizeBase
	NWidgetResizeBase (WidgetType tp, uint fill_x, uint fill_y)
	Constructor for resizable nested widgets.

void	AdjustPaddingForZoom () override

void	SetMinimalSize (uint min_x, uint min_y)
	Set minimal size of the widget.

void	SetMinimalSizeAbsolute (uint min_x, uint min_y)
	Set absolute (post-scaling) minimal size of the widget.

void	SetMinimalTextLines (uint8_t min_lines, uint8_t spacing, FontSize size)
	Set minimal text lines for the widget.

void	SetFill (uint fill_x, uint fill_y)
	Set the filling of the widget from initial size.

void	SetResize (uint resize_x, uint resize_y)
	Set resize step of the widget.

void	SetAspect (float ratio, AspectFlags flags=AspectFlags::ResizeX)
	Set desired aspect ratio of this widget.

void	SetAspect (int x_ratio, int y_ratio, AspectFlags flags=AspectFlags::ResizeX)
	Set desired aspect ratio of this widget, in terms of horizontal and vertical dimensions.

bool	UpdateMultilineWidgetSize (const std::string &str, int max_lines)
	Try to set optimum widget size for a multiline text widget.

bool	UpdateSize (uint min_x, uint min_y)
	Set absolute (post-scaling) minimal size of the widget.

bool	UpdateVerticalSize (uint min_y)
	Set absolute (post-scaling) minimal size of the widget.

void	AssignSizePosition (SizingType sizing, int x, int y, uint given_width, uint given_height, bool rtl) override
	Assign size and position to the widget.

Public Member Functions inherited from NWidgetBase
	NWidgetBase (WidgetType tp)
	Base class constructor.

void	ApplyAspectRatio ()

virtual NWidgetBase *	GetWidgetOfType (WidgetType tp)
	Retrieve a widget by its type.

template<class NWID >
NWID *	GetParentWidget ()
	Get parent widget of type NWID.

template<class NWID >
const NWID *	GetParentWidget () const
	Get parent widget of type NWID.

void	SetPadding (uint8_t top, uint8_t right, uint8_t bottom, uint8_t left)
	Set additional space (padding) around the widget.

void	SetPadding (const RectPadding &padding)
	Set additional space (padding) around the widget.

uint	GetHorizontalStepSize (SizingType sizing) const
	Get the horizontal sizing step.

uint	GetVerticalStepSize (SizingType sizing) const
	Get the vertical sizing step.

virtual void	SetDirty (const Window *w) const
	Mark the widget as 'dirty' (in need of repaint).

Rect	GetCurrentRect () const

Public Member Functions inherited from ZeroedMemoryAllocator
void *	operator new (size_t size)
	Memory allocator for a single class instance.

void *	operator new[] (size_t size)
	Memory allocator for an array of class instances.

void	operator delete (void *ptr)
	Memory release for a single class instance.

void	operator delete[] (void *ptr)
	Memory release for an array of class instances.

Public Member Functions inherited from Scrollbar
	Scrollbar (bool is_vertical)

size_type	GetCount () const
	Gets the number of elements in the list.

size_type	GetCapacity () const
	Gets the number of visible elements of the scrollbar.

size_type	GetPosition () const
	Gets the position of the first visible element in the list.

bool	IsVisible (size_type item) const
	Checks whether given current item is visible in the list.

bool	IsVertical () const
	Is the scrollbar vertical or not?

void	SetStepSize (size_t stepsize)
	Set the distance to scroll when using the buttons or the wheel.

void	SetCount (size_t num)
	Sets the number of elements in the list.

void	SetCapacity (size_t capacity)
	Set the capacity of visible elements.

void	SetCapacityFromWidget (Window *w, WidgetID widget, int padding=0)
	Set capacity of visible elements from the size and resize properties of a widget.

bool	SetPosition (size_type position)
	Sets the position of the first visible element.

bool	UpdatePosition (int difference, ScrollbarStepping unit=SS_SMALL)
	Updates the position of the first visible element by the given amount.

void	ScrollTowards (size_type position)
	Scroll towards the given position; if the item is visible nothing happens, otherwise it will be shown either at the bottom or top of the window depending on where in the list it was.

size_type	GetScrolledRowFromWidget (int clickpos, const Window *const w, WidgetID widget, int padding=0, int line_height=-1) const
	Compute the row of a scrolled widget that a user clicked in.

template<typename Tcontainer >
auto	GetVisibleRangeIterators (Tcontainer &container) const
	Get a pair of iterators for the range of visible elements in a container.

template<typename Tcontainer >
auto	GetScrolledItemFromWidget (Tcontainer &container, int clickpos, const Window *const w, WidgetID widget, int padding=0, int line_height=-1) const
	Return an iterator pointing to the element of a scrolled widget that a user clicked in.

EventState	UpdateListPositionOnKeyPress (int &list_position, uint16_t keycode) const
	Update the given list position as if it were on this scroll bar when the given keycode was pressed.

Static Public Member Functions
static void	InvalidateDimensionCache ()

static Dimension	GetVerticalDimension ()

static Dimension	GetHorizontalDimension ()

Static Private Attributes
static Dimension	vertical_dimension = {0, 0}
	Cached size of vertical scrollbar button.

static Dimension	horizontal_dimension = {0, 0}
	Cached size of horizontal scrollbar button.

Additional Inherited Members
Public Types inherited from Scrollbar
enum	ScrollbarStepping { SS_RAW , SS_SMALL , SS_BIG }
	Stepping sizes when scrolling. More...

using	size_type = int32_t

Data Fields inherited from NWidgetCore
NWidgetDisplay	disp_flags
	Flags that affect display and interaction with the widget.

Colours	colour
	Colour of this widget.

const WidgetID	index
	Index of the nested widget (`-1` means 'not used').

uint32_t	widget_data
	Data of the widget.

StringID	tool_tip
	Tooltip of the widget.

WidgetID	scrollbar_index
	Index of an attached scrollbar.

TextColour	highlight_colour
	Colour of highlight.

TextColour	text_colour
	Colour of text within widget.

FontSize	text_size
	Size of text within widget.

StringAlignment	align
	Alignment of text/image within widget.

Data Fields inherited from NWidgetResizeBase
uint	min_x
	Minimal horizontal size of only this widget.

uint	min_y
	Minimal vertical size of only this widget.

bool	absolute
	Set if minimum size is fixed and should not be resized.

uint	uz_min_x
	Unscaled Minimal horizontal size of only this widget.

uint	uz_min_y
	Unscaled Minimal vertical size of only this widget.

uint8_t	uz_text_lines
	'Unscaled' text lines, stored for resize calculation.

uint8_t	uz_text_spacing
	'Unscaled' text padding, stored for resize calculation.

FontSize	uz_text_size
	'Unscaled' font size, stored for resize calculation.

Data Fields inherited from NWidgetBase
WidgetType	type
	Type of the widget / nested widget.

uint	fill_x
	Horizontal fill stepsize (from initial size, `0` means not resizable).

uint	fill_y
	Vertical fill stepsize (from initial size, `0` means not resizable).

uint	resize_x
	Horizontal resize step (`0` means not resizable).

uint	resize_y
	Vertical resize step (`0` means not resizable).

uint	smallest_x
	Smallest horizontal size of the widget in a filled window.

uint	smallest_y
	Smallest vertical size of the widget in a filled window.

uint	current_x
	Current horizontal size (after resizing).

uint	current_y
	Current vertical size (after resizing).

float	aspect_ratio = 0
	Desired aspect ratio of widget.

AspectFlags	aspect_flags = AspectFlags::ResizeX
	Which dimensions can be resized.

int	pos_x
	Horizontal position of top-left corner of the widget in the window.

int	pos_y
	Vertical position of top-left corner of the widget in the window.

RectPadding	padding
	Padding added to the widget. Managed by parent container widget. (parent container may swap left and right for RTL)

RectPadding	uz_padding
	Unscaled padding, for resize calculation.

NWidgetBase *	parent
	Parent widget of this widget, automatically filled in when added to container.

Static Public Attributes inherited from Scrollbar
static constexpr size_type	max_size_type = std::numeric_limits<size_type>::max()

static constexpr size_type	npos = max_size_type

Protected Member Functions inherited from NWidgetBase
void	StoreSizePosition (SizingType sizing, int x, int y, uint given_width, uint given_height)
	Store size and position.

Detailed Description

Nested widget to display and control a scrollbar in a window.

Also assign the scrollbar to other widgets using SetScrollbar() to make the mousewheel work.

Definition at line 896 of file widget_type.h.

Constructor & Destructor Documentation

◆ NWidgetScrollbar()

NWidgetScrollbar::NWidgetScrollbar	(	WidgetType	tp,
		Colours	colour,
		WidgetID	index
	)

Scrollbar widget.

Parameters

tp	Scrollbar type. (horizontal/vertical)
colour	Colour of the scrollbar.
index	Index of the widget.

Definition at line 2496 of file widget.cpp.

References NWID_HSCROLLBAR, NWID_VSCROLLBAR, NWidgetCore::SetDataTip(), NWidgetResizeBase::SetFill(), NWidgetResizeBase::SetResize(), and NWidgetBase::type.

Member Function Documentation

◆ Draw()

void NWidgetScrollbar::Draw ( const Window * w )

overridevirtual

Draw the widgets of the tree.

The function calls Window::DrawWidget for each widget with a non-negative index, after the widget itself is painted.

Parameters

w	Window that owns the tree.

Implements NWidgetBase.

Definition at line 2538 of file widget.cpp.

References WidgetDimensions::bevel, NWidgetCore::colour, NWidgetBase::current_x, NWidgetBase::current_y, NWidgetCore::disp_flags, DrawHorizontalScrollbar(), DrawVerticalScrollbar(), FILLRECT_CHECKER, GetColourGradient(), GfxFillRect(), HasBit(), NWidgetCore::IsDisabled(), Window::mouse_capture_widget, ND_SCROLLBAR_BTN, NDB_SCROLLBAR_DOWN, NDB_SCROLLBAR_UP, NWID_HSCROLLBAR, WidgetDimensions::scaled, Rect::Shrink(), and NWidgetBase::type.

◆ GetHorizontalDimension()

Dimension NWidgetScrollbar::GetHorizontalDimension ( )

static

Definition at line 2580 of file widget.cpp.

◆ GetVerticalDimension()

Dimension NWidgetScrollbar::GetVerticalDimension ( )

static

Definition at line 2570 of file widget.cpp.

◆ InvalidateDimensionCache()

void NWidgetScrollbar::InvalidateDimensionCache ( )

static

Definition at line 2564 of file widget.cpp.

◆ SetupSmallestSize()

void NWidgetScrollbar::SetupSmallestSize ( Window * w )

overridevirtual

Compute smallest size needed by the widget.

The smallest size of a widget is the smallest size that a widget needs to display itself properly. In addition, filling and resizing of the widget are computed. The function calls Window::UpdateWidgetSize for each leaf widget and background widget without child with a non-negative index.

Parameters

w	Window owning the widget.

Note: After the computation, the results can be queried by accessing the smallest_x and smallest_y data members of the widget.

Implements NWidgetBase.

Definition at line 2517 of file widget.cpp.

References NWidgetResizeBase::min_x, NWidgetResizeBase::min_y, NWID_HSCROLLBAR, NWID_VSCROLLBAR, NWidgetResizeBase::SetMinimalSizeAbsolute(), NWidgetBase::smallest_x, NWidgetBase::smallest_y, and NWidgetBase::type.

Field Documentation

◆ horizontal_dimension

Dimension NWidgetScrollbar::horizontal_dimension = {0, 0}

staticprivate

Cached size of horizontal scrollbar button.

Definition at line 2591 of file widget_type.h.

◆ vertical_dimension

Dimension NWidgetScrollbar::vertical_dimension = {0, 0}

staticprivate

Cached size of vertical scrollbar button.

Definition at line 2590 of file widget_type.h.

The documentation for this class was generated from the following files:

src/widget_type.h
src/widget.cpp

Public Member Functions

Static Public Member Functions

Static Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ NWidgetScrollbar()

Member Function Documentation

◆ Draw()

◆ GetHorizontalDimension()

◆ GetVerticalDimension()

◆ InvalidateDimensionCache()

◆ SetupSmallestSize()

Field Documentation

◆ horizontal_dimension

◆ vertical_dimension