1.8
Public Member Functions | Static Public Member Functions | Protected Member Functions | List of all members
Button Class Reference

Basic button control. More...

Inheritance diagram for Button:
Inheritance graph
[legend]

Public Member Functions

 Button (Button &&) noexcept=default
 
 Button (const Button &)=delete
 
 Button (const std::string &text, const Rect &rect, const AlignFlags &text_align=default_text_align()) noexcept
 
 Button (const std::string &text={}, const AlignFlags &text_align=default_text_align()) noexcept
 
 Button (Frame &parent, const std::string &text, const Rect &rect, const AlignFlags &text_align=default_text_align()) noexcept
 
 Button (Frame &parent, const std::string &text={}, const AlignFlags &text_align=default_text_align()) noexcept
 
 Button (Serializer::Properties &props) noexcept
 
 ~Button () noexcept override
 
EGT_NODISCARD bool checked () const
 Get the boolean checked state of the a widget. More...
 
virtual void checked (bool value)
 Set the checked state of the widget. More...
 
void checked (bool value) override
 Set the checked state of the widget. More...
 
void draw (Painter &painter, const Rect &rect) override
 Draw the widget. More...
 
void handle (Event &event) override
 Handle an event. More...
 
EGT_NODISCARD Size min_size_hint () const override
 Get a minimum size hint for the Widget. More...
 
RegisterHandle on_click (const EventCallback &handler)
 Add an event handler to be called when the widget receives an EventId::pointer_click event. More...
 
Buttonoperator= (Button &&) noexcept=default
 
Buttonoperator= (const Button &)=delete
 
virtual EGT_NODISCARD const std::string & text () const
 Get the text of the Label. More...
 
virtual void text (const std::string &str)
 Set the text. More...
 
void text (const std::string &text) override
 Set the text. More...
 
- Public Member Functions inherited from TextWidget
 TextWidget (Serializer::Properties &props) noexcept
 
 TextWidget (std::string text={}, const Rect &rect={}, const AlignFlags &text_align=AlignFlag::center) noexcept
 
virtual void clear ()
 Clear the text value. More...
 
virtual EGT_NODISCARD size_t len () const
 Get the length of the text. More...
 
void serialize (Serializer &serializer) const override
 Serialize the widget to the specified serializer. More...
 
virtual EGT_NODISCARD const std::string & text () const
 Get the text of the Label. More...
 
EGT_NODISCARD AlignFlags text_align () const
 Get the text alignment within the Label. More...
 
void text_align (const AlignFlags &align)
 Set the text alignment within the Label. More...
 
- Public Member Functions inherited from Widget
 Widget (const Rect &rect={}, const Widget::Flags &flags={}) noexcept
 
 Widget (const Widget &)=delete
 
 Widget (Frame &parent, const Rect &rect={}, const Widget::Flags &flags={}) noexcept
 
 Widget (Serializer::Properties &props) noexcept
 
 Widget (Widget &&) noexcept=default
 
 ~Widget () noexcept override
 
EGT_NODISCARD bool active () const
 Get the active state. More...
 
void active (bool value)
 Set the active state. More...
 
AlignFlagsalign ()
 Get the alignment. More...
 
EGT_NODISCARD const AlignFlagsalign () const
 Get the alignment. More...
 
void align (const AlignFlags &a)
 Align the widget. More...
 
EGT_NODISCARD float alpha () const
 Get the alpha property. More...
 
void alpha (float alpha)
 Set the alpha property. More...
 
EGT_NODISCARD bool autoresize () const
 Return the autoresize state of the widget. More...
 
void autoresize (bool value)
 Set the autoresize state. More...
 
EGT_NODISCARD DefaultDim border () const
 Get the border width. More...
 
void border (DefaultDim border)
 Set the border width. More...
 
EGT_NODISCARD Theme::BorderFlags border_flags () const
 Get the border flags. More...
 
void border_flags (const Theme::BorderFlags &flags)
 Set the border flags. More...
 
EGT_NODISCARD float border_radius () const
 Get the border radius. More...
 
void border_radius (float radius)
 Set the border radius. More...
 
EGT_NODISCARD const Rectbox () const
 Bounding box for the Widget. More...
 
void box (const Rect &rect)
 Change the bounding box of the widget. More...
 
bool can_handle_event () const
 Returns true if the widget is capable of handling an event. More...
 
EGT_NODISCARD Point center () const
 Get the center point of the widget's box(). More...
 
EGT_NODISCARD bool checked () const
 Get the boolean checked state of the a widget. More...
 
EGT_NODISCARD bool clip () const
 Return the clip state of the widget. More...
 
EGT_NODISCARD const Patterncolor (Palette::ColorId id) const
 Get a Widget color. More...
 
void color (Palette::ColorId id, const Pattern &color, Palette::GroupId group=Palette::GroupId::normal)
 Add a color to the widget's instance palette. More...
 
EGT_NODISCARD const Patterncolor (Palette::ColorId id, Palette::GroupId group) const
 Get a Widget color. More...
 
virtual EGT_NODISCARD Rect content_area () const
 Return the area that content is allowed to be positioned into. More...
 
virtual void damage ()
 Damage the box() of the widget and cause a redraw. More...
 
virtual void damage (const Rect &rect)
 Mark the specified rect as a damaged area of the widget. More...
 
virtual void deserialize_children (const Deserializer &deserializer)
 Deserialize the children of this widget. More...
 
void detach ()
 Detach this widget from its parent. More...
 
void disable ()
 Set the disabled state to true. More...
 
void disable_toggle ()
 Toggle the disabled state. More...
 
EGT_NODISCARD bool disabled () const
 Return the disabled state of the widget. More...
 
void disabled (bool value)
 Set the disabled state. More...
 
DisplayPoint display_origin ()
 Get the display origin of the Widget. More...
 
virtual Point display_to_local (const DisplayPoint &p)
 Convert a display point to a local point. More...
 
void draw_box (Painter &painter, Palette::ColorId bg, Palette::ColorId border) const
 Helper function to draw this widget's box using the appropriate theme. More...
 
void draw_circle (Painter &painter, Palette::ColorId bg, Palette::ColorId border) const
 Helper function to draw this widget's circle using the appropriate theme. More...
 
void enable ()
 Set the disabled state to false. More...
 
Theme::FillFlagsfill_flags ()
 Get a modifiable fill flags reference. More...
 
EGT_NODISCARD const Theme::FillFlagsfill_flags () const
 Get the fill flags. More...
 
void fill_flags (const Theme::FillFlags &flags)
 Set the fill flags. More...
 
EGT_NODISCARD bool focus () const
 Get the current focus state. More...
 
void focus (bool value)
 Set the focus state. More...
 
EGT_NODISCARD const Fontfont () const
 Get the widget Font. More...
 
void font (const Font &font)
 Set the widget Font. More...
 
EGT_NODISCARD bool frame () const
 Return the frame state of the widget. More...
 
EGT_NODISCARD bool grab_mouse () const
 Return the grab_mouse state of the widget. More...
 
void grab_mouse (bool value)
 Set the grab_mouse state. More...
 
bool has_font () const
 Check whether the widget has a custom Font. More...
 
EGT_NODISCARD bool has_palette () const
 Check whether the widget has a custom palette. More...
 
EGT_NODISCARD DefaultDim height () const
 Height of the widget's box(). More...
 
void height (DefaultDim h)
 Change the height. More...
 
virtual void hide ()
 Hide the Widget. More...
 
EGT_NODISCARD DefaultDim horizontal_ratio () const
 Get the horizontal ratio relative to parent. More...
 
void horizontal_ratio (DefaultDim horizontal)
 Set the horizontal ratio relative to parent. More...
 
EGT_NODISCARD bool in_layout () const
 Indicate if the Widget is computing the layout or not. More...
 
virtual void layout ()
 Perform layout of the Widget. More...
 
DisplayPoint local_to_display (const Point &p)
 Convert a local point to a display point. More...
 
EGT_NODISCARD DefaultDim margin () const
 Get the margin width. More...
 
void margin (DefaultDim margin)
 Set the margin width. More...
 
void min_size_hint (const Size &size)
 Set the minimum size hint for the Widget. More...
 
EGT_NODISCARD size_t moat () const
 Get the sum of the margin(), padding(), and border() around the content of the widget. More...
 
virtual void move (const Point &point)
 Move the Widget to a new position. More...
 
void move_to_center ()
 Move the widget to the center of its parent. More...
 
void move_to_center (const Point &point)
 Move the widget to the specified center point. More...
 
EGT_NODISCARD bool no_layout () const
 Return the no_layout state of the widget. More...
 
void no_layout (bool value)
 Set the no_layout state. More...
 
virtual void on_screen_resized ()
 Called from ComposerScreen::resize(). More...
 
Widgetoperator= (const Widget &)=delete
 
Widgetoperator= (Widget &&) noexcept=default
 
EGT_NODISCARD DefaultDim padding () const
 Return the padding width. More...
 
void padding (DefaultDim padding)
 Set the padding width. More...
 
virtual void paint (Painter &painter)
 Paint the Widget using a Painter. More...
 
virtual void paint_to_file (const std::string &filename={})
 Draw the widget to a file. More...
 
EGT_NODISCARD const Palettepalette () const
 Get the widget palette. More...
 
void palette (const Palette &palette)
 Set the widget instance Palette. More...
 
Widgetparent ()
 Get a pointer to the parent Widget, or nullptr if none exists. More...
 
EGT_NODISCARD const Widgetparent () const
 Get a pointer to the parent Widget, or nullptr if none exists. More...
 
EGT_NODISCARD bool plane_window () const
 Return the plane_window state of the widget. More...
 
EGT_NODISCARD const Pointpoint () const
 Get the origin of the widget's box(). More...
 
virtual void post_deserialize (Serializer::Properties &props)
 Resume deserializing of the widget after its children have been deserialized. More...
 
void ratio (DefaultDim horizontal, DefaultDim vertical)
 Set the size ratio relative to parent. More...
 
void ratio (DefaultDim ratio)
 Set the size ratio relative to parent. More...
 
EGT_NODISCARD bool readonly () const
 Get the readonly state of the widget. More...
 
void readonly (bool value)
 Set the readonly state of the widget. More...
 
void readonly_toggle ()
 Toggle the readonly state. More...
 
void reset_font ()
 Reset the widget's Font. More...
 
void reset_palette ()
 Clear the widget instance palette. More...
 
virtual void resize (const Size &size)
 Resize the widget. More...
 
void resize_by_ratio (DefaultDim hratio, DefaultDim vratio)
 Scale the current size of the Widget given the ratio. More...
 
void resize_by_ratio (DefaultDim ratio)
 Scale the current size of the Widget given the ratio. More...
 
virtual void scale (float hscale, float vscale)
 Set the scale of the widget. More...
 
void scale (float scale)
 Set the scale of the widget. More...
 
virtual EGT_NODISCARD Screenscreen () const
 Get a pointer to the Screen instance, using using a parent as necessary. More...
 
virtual void serialize_children (Serializer &serializer) const
 Serialize the widget's children to the specified serializer. More...
 
virtual void show ()
 Show the Widget. More...
 
EGT_NODISCARD const Sizesize () const
 Get the size of the widget's box(). More...
 
EGT_NODISCARD const Themetheme () const
 Get the Widget Theme. More...
 
EGT_NODISCARD Point to_parent (const Point &r) const
 Convert a point with a local origin to a parent origin. More...
 
EGT_NODISCARD Rect to_parent (const Rect &r) const
 Convert a point in a rect a local origin to a parent origin. More...
 
virtual EGT_NODISCARD std::string type () const
 Returns a string representation of the type of this widget. More...
 
EGT_NODISCARD const Rectuser_requested_box () const
 Get the box corresponding to the user requested one, not the actual one. More...
 
EGT_NODISCARD DefaultDim vertical_ratio () const
 Get the vertical ratio relative to parent. More...
 
void vertical_ratio (DefaultDim vertical)
 Set the vertical ratio relative to parent. More...
 
EGT_NODISCARD bool visible () const
 Get the visible state of the widget. More...
 
void visible (bool value)
 Set the visible state. More...
 
void visible_toggle ()
 Toggle the visibility state. More...
 
virtual void walk (const WalkCallback &callback, int level=0)
 Walk the Widget tree and call callback with each Widget. More...
 
EGT_NODISCARD WidgetId widgetid () const
 Get the unique id of the widget. More...
 
EGT_NODISCARD DefaultDim width () const
 Width of the widget's box(). More...
 
void width (DefaultDim w)
 Change the width. More...
 
EGT_NODISCARD DefaultDim x () const
 X coordinate of the widget's box(). More...
 
void x (DefaultDim x)
 Set the X coordinate of the box. More...
 
EGT_NODISCARD DefaultDim xratio () const
 Get the X position ratio relative to parent. More...
 
void xratio (DefaultDim xratio)
 Set the X position ratio relative to parent. More...
 
EGT_NODISCARD DefaultDim y () const
 Y coordinate of the widget's box(). More...
 
void y (DefaultDim y)
 Set the Y coordinate of the box. More...
 
EGT_NODISCARD DefaultDim yratio () const
 Get the Y position ratio relative to parent. More...
 
void yratio (DefaultDim yratio)
 Set the Y position ratio relative to parent. More...
 
virtual EGT_NODISCARD size_t zorder () const
 Get the zorder of the widget. More...
 
virtual void zorder (size_t rank)
 Set the zorder of the widget. More...
 
virtual void zorder_bottom ()
 Move the widget to the bottom. More...
 
virtual void zorder_down ()
 Move this widgets zorder down relative to other widgets with the same parent. More...
 
virtual void zorder_top ()
 Move the widget to the top. More...
 
virtual void zorder_up ()
 Move this widgets zorder up relative to other widgets with the same parent. More...
 
- Public Member Functions inherited from Object
 Object () noexcept=default
 
 Object (const Object &)=delete
 
 Object (Object &&)=default
 
virtual ~Object () noexcept=default
 
void clear_handlers ()
 Clear all registered event handlers. More...
 
void invoke_handlers (Event &event)
 Invoke all handlers with the specified event. More...
 
void invoke_handlers (EventId event)
 Invoke all handlers with the specified EventId. More...
 
EGT_NODISCARD const std::string & name () const
 Get the name of the Object. More...
 
void name (const std::string &name)
 Set the name of the Object. More...
 
RegisterHandle on_event (const EventCallback &handler, const FilterFlags &mask={})
 Add an event handler to be called when the widget generates an event. More...
 
Objectoperator= (const Object &)=delete
 
Objectoperator= (Object &&)=default
 
void remove_handler (RegisterHandle handle)
 Remove an event handler. More...
 

Static Public Member Functions

static void default_draw (const Button &widget, Painter &painter, const Rect &rect)
 Default draw method for the widget. More...
 
static Size default_size ()
 Default button size. More...
 
static void default_size (const Size &size)
 Change default button size. More...
 
static AlignFlags default_text_align ()
 Change text align. More...
 
static void default_text_align (const AlignFlags &align)
 Change default text align. More...
 
- Static Public Member Functions inherited from TextWidget
static Font scale_font (const Size &target, const std::string &text, const Font &font)
 Given a Font, text, and a target Size, scale the font size so that the text will will fit and return the new Font. More...
 

Protected Member Functions

 Button (Serializer::Properties &props, bool is_derived) noexcept
 
void set_parent (Widget *parent) override
 Set this widget's parent. More...
 
- Protected Member Functions inherited from TextWidget
 TextWidget (Serializer::Properties &props, bool is_derived) noexcept
 
EGT_NODISCARD Size text_size (const std::string &text) const
 Get the size of the text. More...
 
- Protected Member Functions inherited from Widget
 Widget (Serializer::Properties &props, bool is_derived) noexcept
 
void add_component (Widget &widget)
 Add a component. More...
 
void add_damage (const Rect &rect)
 Add damage to the damage array. More...
 
virtual void begin_draw ()
 Cause the widget to draw itself and all of its children. More...
 
void begin_draw (Widget *parent)
 Call the begin_draw() method of the parent. More...
 
EGT_NODISCARD detail::Range< SubordinatesArray > & children ()
 Return the array of child widgets. More...
 
EGT_NODISCARD const detail::Range< SubordinatesArraychildren () const
 Return the array of child widgets. More...
 
EGT_NODISCARD bool component () const
 Get the component status. More...
 
void component (bool value)
 Set the component flag. More...
 
virtual void damage_from_subordinate (const Rect &rect)
 Special variation of damage() that is to be called explicitly by subordinate widgets. More...
 
void deserialize_leaf (Serializer::Properties &props)
 Deserialize widget properties that require to call overridden methods. More...
 
Widgetfind_screen ()
 Starting from this Widget, find the Widget that has a Screen. More...
 
EGT_NODISCARD const Widgetfind_screen () const
 Starting from this Widget, find the Widget that has a Screen. More...
 
Widget::Flagsflags ()
 Get a modifiable ref of the flags. More...
 
EGT_NODISCARD const Widget::Flagsflags () const
 Get a const ref of the flags. More...
 
virtual EGT_NODISCARD bool has_screen () const
 Does this Widget have a screen? More...
 
EGT_NODISCARD Rect local_box () const
 Get the local box which is the same size as box(), but with the origin zeroed. More...
 
EGT_NODISCARD bool parent_in_layout ()
 Indicate if our parent is computing the layout. More...
 
void parent_layout ()
 Call our parent to do a layout. More...
 
void remove_component (Widget *widget)
 Remove a component. More...
 
void special_child_draw (Painter &painter, Widget *widget)
 Special draw function that can be invoked when drawing each child. More...
 
EGT_NODISCARD ChildDrawCallback special_child_draw_callback () const
 Get the special child draw callback. More...
 
void special_child_draw_callback (ChildDrawCallback func)
 Set the special child draw callback. More...
 
EGT_NODISCARD ChildDrawCallback special_child_draw_callback (Widget *parent) const
 Get the child draw callback of the parent. More...
 
virtual Point to_panel (const Point &p)
 Convert a local point to the coordinate system of the current panel. More...
 
virtual EGT_NODISCARD Point to_subordinate (const Point &p) const
 Convert a point with an origin of the current widget to subordinate origin. More...
 
EGT_NODISCARD Rect to_subordinate (Rect rect) const
 
virtual EGT_NODISCARD bool top_level () const
 Is this widget a top level widget? More...
 
size_t zorder (const Widget *widget) const
 Get the zorder of the widget. More...
 
void zorder (const Widget *widget, size_t rank)
 Set the zorder of the widget. More...
 
void zorder_bottom (const Widget *widget)
 Move the specified widget zorder to the bottom of the current list of widgets with the same parent. More...
 
void zorder_down (const Widget *widget)
 Move the specified widget zorder down relative to other widgets with the same parent. More...
 
void zorder_top (const Widget *widget)
 Move the specified widget zorder to the top of the current list of widgets with the same parent. More...
 
void zorder_up (const Widget *widget)
 Move the specified widget zorder up relative to other widgets with the same parent. More...
 

Additional Inherited Members

- Public Types inherited from Widget
enum class  Flag : uint32_t {
  plane_window = detail::bit(0) , window = detail::bit(1) , frame = detail::bit(2) , disabled = detail::bit(3) ,
  readonly = detail::bit(4) , active = detail::bit(5) , invisible = detail::bit(6) , grab_mouse = detail::bit(7) ,
  no_clip = detail::bit(8) , no_layout = detail::bit(9) , no_autoresize = detail::bit(10) , checked = detail::bit(11) ,
  component = detail::bit(12)
}
 Common flags used for various widget properties. More...
 
using Flags = egt::Flags< Widget::Flag >
 Widget flags. More...
 
using WalkCallback = std::function< bool(Widget *widget, int level)>
 Callback definition used by walk(). More...
 
using WidgetId = uint64_t
 Type used to identify a unique Widget ID. More...
 
- Public Types inherited from Object
using EventCallback = std::function< void(Event &event)>
 Event handler callback function. More...
 
using FilterFlags = FlagsBase< EventId >
 Event handler EventId filter. More...
 
using RegisterHandle = uint64_t
 Handle type. More...
 
- Public Attributes inherited from TextWidget
Signal on_text_changed
 Event signal. More...
 
- Public Attributes inherited from Widget
Signal on_checked_changed
 Event signal. More...
 
Signal on_gain_focus
 Invoked when the widget gains focus. More...
 
Signal on_lost_focus
 Invoked when the widget loses focus. More...
 
Signal on_show
 Invoked when a widget is shown. More...
 
Signal on_hide
 Invoked when a widget is hidden. More...
 
- Protected Types inherited from Widget
using ChildDrawCallback = std::function< void(Painter &painter, Widget *widget)>
 Helper type that defines the special draw child callback. More...
 
using SubordinatesArray = std::list< std::shared_ptr< Widget > >
 Helper type for an array of subordinate widgets. More...
 
- Protected Types inherited from Object
using CallbackArray = std::vector< CallbackMeta >
 Helper type for an array of callbacks. More...
 
- Protected Attributes inherited from TextWidget
std::string m_text
 The text. More...
 
AlignFlags m_text_align {AlignFlag::center}
 Alignment of the text. More...
 
- Protected Attributes inherited from Widget
Rect m_box
 Bounding box. More...
 
detail::Range< SubordinatesArraym_children
 Array of child widgets in the order they were added. More...
 
SubordinatesArray::iterator m_components_begin
 Iterator for the beginning of components which are positionned after children in the subordinates array. More...
 
Screen::DamageArray m_damage
 The damage array for this widget. More...
 
bool m_in_draw {false}
 Status for whether this widget is currently drawing. More...
 
bool m_in_layout {false}
 Status for whether this widget is currently performing layout. More...
 
Size m_min_size
 Minimum size of the widget when not an empty value. More...
 
Widgetm_parent {nullptr}
 Pointer to this widget's parent. More...
 
ChildDrawCallback m_special_child_draw_callback
 Used internally for calling the special child draw function. More...
 
SubordinatesArray m_subordinates
 Array of subordinates widgets split in child widgets and component widgets. More...
 
Rect m_user_requested_box
 Keep track of the box requested by the user. More...
 
WidgetId m_widgetid {0}
 Unique ID of this widget. More...
 
- Protected Attributes inherited from Object
detail::CopyOnWriteAllocate< CallbackArraym_callbacks
 Array of callbacks. More...
 
RegisterHandle m_handle_counter {0}
 Counter used to generate unique handles for each callback registration. More...
 
std::string m_name
 A user defined name for the Object. More...
 

Detailed Description

Basic button control.

This presents a clickable control that can be used to respond to user pointer events.

Supported Features:

Example

Button btn("Button");
// handle the clicked event of the button
btn.on_event([](Event&){
cout << "clicked!" << endl;
Button(const std::string &text={}, const AlignFlags &text_align=default_text_align()) noexcept
@ pointer_click
Pointer event.

Constructor & Destructor Documentation

◆ Button() [1/8]

Button ( const std::string &  text = {},
const AlignFlags text_align = default_text_align() 
)
explicitnoexcept
Parameters
[in]textThe text to display.
[in]text_alignAlignment for the text.

◆ Button() [2/8]

Button ( const std::string &  text,
const Rect rect,
const AlignFlags text_align = default_text_align() 
)
noexcept
Parameters
[in]textThe text to display.
[in]rectInitial rectangle of the widget.
[in]text_alignAlignment for the text.

◆ Button() [3/8]

Button ( Frame parent,
const std::string &  text = {},
const AlignFlags text_align = default_text_align() 
)
explicitnoexcept
Parameters
[in]parentThe parent Frame.
[in]textThe text to display.
[in]text_alignAlignment for the text.

◆ Button() [4/8]

Button ( Frame parent,
const std::string &  text,
const Rect rect,
const AlignFlags text_align = default_text_align() 
)
noexcept
Parameters
[in]parentThe parent Frame.
[in]textThe text to display.
[in]rectInitial rectangle of the widget.
[in]text_alignAlignment for the text.

◆ Button() [5/8]

Button ( Serializer::Properties props)
inlineexplicitnoexcept
Parameters
[in]propslist of widget argument and its properties.

◆ Button() [6/8]

Button ( Serializer::Properties props,
bool  is_derived 
)
explicitprotectednoexcept

◆ Button() [7/8]

Button ( const Button )
delete

◆ Button() [8/8]

Button ( Button &&  )
defaultnoexcept

◆ ~Button()

~Button ( )
overridenoexcept

Member Function Documentation

◆ checked() [1/3]

EGT_NODISCARD bool checked
inline

Get the boolean checked state of the a widget.

Returns
true if checked.

◆ checked() [2/3]

virtual void checked

Set the checked state of the widget.

◆ checked() [3/3]

void checked ( bool  value)
overridevirtual

Set the checked state of the widget.

Reimplemented from Widget.

◆ default_draw()

static void default_draw ( const Button widget,
Painter painter,
const Rect rect 
)
static

Default draw method for the widget.

◆ default_size() [1/2]

static Size default_size ( )
static

Default button size.

◆ default_size() [2/2]

static void default_size ( const Size size)
static

Change default button size.

◆ default_text_align() [1/2]

static AlignFlags default_text_align ( )
static

Change text align.

◆ default_text_align() [2/2]

static void default_text_align ( const AlignFlags align)
static

Change default text align.

◆ draw()

void draw ( Painter painter,
const Rect rect 
)
overridevirtual

Draw the widget.

To change how a widget is drawn, this function can be overloaded and changed in a derived class, or it can be changed dynamically with the Theme.

To optimize drawing, a Widget may use the Rect parameter to limit what needs to be redrawn, which may be smaller than the widget's box(), but will never be outside the widget's box().

Painter will always be supplied in a default state to this function, so there is no need to do any cleanup or state saving inside this draw() function.

Warning
Normally this should not be called directly and instead the EventLoop will call this function with an already established Painter when the Widget needs to be drawn.
See also
Color, Palette, and Theme and Drawing
Parameters
[in]painterInstance of the Painter for the Screen.
[in]rectThe rectangle to draw.

Reimplemented from Widget.

Reimplemented in RadioBox, ImageHolder< Button, Palette::ColorId::button_bg, Palette::ColorId::border, Palette::ColorId::button_text >, ImageHolder< Button, Palette::ColorId::button_bg, Palette::ColorId::border, Palette::ColorId::button_text >, ToggleBox, and CheckBox.

◆ handle()

void handle ( Event event)
overridevirtual

Handle an event.

This handles global events that usually do not originate at the widget. For example, a pointer event. All events are defined by egt::EventId.

The default implementation in the Widget class, will dispatch the event to any third party handlers that have been registered with on_event(). What this means is if you expect other handlers to receive the events then this must be called from derived classes. Or, manually call invoke_handlers().

Override this function in a derived class to handle events.

See also
Events
Parameters
eventThe Event that occurred.

Reimplemented from Widget.

Reimplemented in RadioBox, and CheckBox.

◆ min_size_hint()

EGT_NODISCARD Size min_size_hint ( ) const
overridevirtual

Get a minimum size hint for the Widget.

This is used by sizers to pick minimum and default dimensions when no other force is used.

Reimplemented from Widget.

Reimplemented in RadioBox, ImageHolder< Button, Palette::ColorId::button_bg, Palette::ColorId::border, Palette::ColorId::button_text >, ImageHolder< Button, Palette::ColorId::button_bg, Palette::ColorId::border, Palette::ColorId::button_text >, ToggleBox, and CheckBox.

◆ on_click()

RegisterHandle on_click ( const EventCallback handler)
inline

Add an event handler to be called when the widget receives an EventId::pointer_click event.

Parameters
handlerThe callback to invoke on event.
Returns
A handle used to identify the registration. This can then be passed to remove_handler().
See also
detail::Object::on_event()

◆ operator=() [1/2]

Button& operator= ( Button &&  )
defaultnoexcept

◆ operator=() [2/2]

Button& operator= ( const Button )
delete

◆ set_parent()

void set_parent ( Widget parent)
overrideprotectedvirtual

Set this widget's parent.

Reimplemented from Widget.

◆ text() [1/3]

virtual EGT_NODISCARD const std::string& text ( void  )
inline

Get the text of the Label.

◆ text() [2/3]

virtual void text ( void  )

Set the text.

Parameters
strThe text string to set.

◆ text() [3/3]

void text ( const std::string &  str)
overridevirtual

Set the text.

Parameters
strThe text string to set.

Reimplemented from TextWidget.

Reimplemented in RadioBox, and CheckBox.