xtd - Reference Guide  0.1.0
Modern c++17 framework to create console, gui and unit test applications on Windows, macOS and Linux.
xtd::forms::combo_box Class Reference

Represents a Windows combo box control. More...

#include <combo_box.h>

Inheritance diagram for xtd::forms::combo_box:
xtd::forms::list_control xtd::forms::control xtd::forms::component xtd::forms::iwin32_window

Public Types

using control_collection = layout::arranged_element_collection< control_ref >
 Represents a collection of controls. More...
 
using item_collection = layout::arranged_element_collection< item, item::sorter >
 

Public Member Functions

 combo_box ()
 Initializes a new instance of the combo_box class. More...
 
virtual anchor_styles anchor () const
 Gets the edges of the container to which a control is bound and determines how a control is resized with its parent. More...
 
virtual controlanchor (anchor_styles anchor)
 Gets the edges of the container to which a control is bound and determines how a control is resized with its parent. More...
 
virtual drawing::point auto_scroll_point () const
 Gets where this control is scrolled to in scroll_control_into_view(control). More...
 
virtual bool auto_size () const
 Gets a value that indicates whether the control resizes based on its contents. More...
 
virtual controlauto_size (bool auto_size)
 Sets a value that indicates whether the control resizes based on its contents. More...
 
virtual drawing::color back_color () const
 Gets the background color for the control. More...
 
virtual controlback_color (const drawing::color &color)
 Sets the background color for the control. More...
 
async_result_invoke begin_invoke (delegate< void(std::vector< std::any >)> value, const std::vector< std::any > &args)
 
async_result_invoke begin_invoke (delegate< void()> value)
 
void begin_update ()
 
virtual int32_t bottom () const
 Gets the distance, in pixels, between the bottom edge of the control and the top edge of its container's client area. More...
 
virtual drawing::rectangle bounds () const
 Gets the size and location of the control including its nonclient elements, in pixels, relative to the parent control. More...
 
virtual controlbounds (const drawing::rectangle &bounds)
 Sets the size and location of the control including its nonclient elements, in pixels, relative to the parent control. More...
 
virtual void bring_to_front ()
 
virtual bool can_focus () const
 Gets a value indicating whether the control can receive focus. More...
 
bool can_raise_events () const override
 Determines if events can be raised on the control. More...
 
virtual bool can_select () const
 Gets a value indicating whether the control can be selected. More...
 
virtual const drawing::rectangleclient_rectangle () const
 Gets the rectangle that represents the client area of the control. More...
 
virtual const drawing::sizeclient_size () const
 Gets the height and width of the client area of the control. More...
 
virtual controlclient_size (const drawing::size &client_size)
 Sets the height and width of the client area of the control. More...
 
virtual std::string compagny_name () const
 Gets the name of the company or creator of the application containing the control. More...
 
virtual control_collectioncontrols ()
 Gets the collection of controls contained within the control. More...
 
virtual const control_collectioncontrols () const
 Gets the collection of controls contained within the control. More...
 
void create_control ()
 
drawing::graphics create_graphics () const
 
virtual void create_handle ()
 
virtual bool created ()
 Gets a value indicating whether the control has been created. More...
 
virtual forms::cursor cursor () const
 
virtual controlcursor (const forms::cursor &cursor)
 
virtual forms::cursor default_cursor () const
 
virtual drawing::font default_font () const
 
virtual drawing::size default_size () const override
 
void destroy_control ()
 
virtual void destroy_handle ()
 
virtual drawing::rectangle display_rectangle () const
 
virtual dock_style dock () const
 Gets or sets which control borders are docked to its parent control and determines how a control is resized with its parent. More...
 
virtual controldock (dock_style dock)
 
virtual bool double_buffered () const
 
virtual controldouble_buffered (bool double_buffered)
 
combo_box_style drop_down_style () const
 
combo_boxdrop_down_style (combo_box_style drop_down_style)
 
virtual bool enabled () const
 
virtual controlenabled (bool enabled)
 
void end_invoke (async_result_invoke async)
 
void end_update ()
 
bool focus ()
 
virtual bool focused () const
 
virtual drawing::font font () const
 
virtual controlfont (const drawing::font &font)
 
virtual drawing::color fore_color () const
 
virtual controlfore_color (const drawing::color &color)
 
intptr_t handle () const override
 Gets the handle to the window represented by the implementer. More...
 
virtual int32_t height () const
 
virtual controlheight (int32_t height)
 
virtual void hide ()
 
virtual void invalidate () const
 
virtual void invalidate (bool invalidate_children) const
 
virtual void invalidate (const drawing::rectangle &rect) const
 
virtual void invalidate (const drawing::rectangle &rect, bool invalidate_children) const
 
void invoke (delegate< void(std::vector< std::any >)> value, const std::vector< std::any > &args)
 
void invoke (delegate< void()> value)
 
bool is_handle_created () const
 
item_collectionitems ()
 
const item_collectionitems () const
 
const combo_boxitems (const item_collection &items)
 
virtual int32_t left () const
 
virtual controlleft (int32_t left)
 
virtual drawing::point location () const
 
virtual controllocation (const drawing::point &location)
 
virtual forms::padding margin () const
 
virtual controlmargin (const forms::padding &margin)
 
virtual const std::string & name () const
 
virtual controlname (const std::string &name)
 
virtual forms::padding padding () const
 
virtual controlpadding (const forms::padding &padding)
 
virtual std::optional< control_refparent () const
 
virtual controlparent (const control &parent)
 
virtual controlparent (std::nullptr_t)
 
void perform_layout ()
 Forces the control to apply layout logic to all its child controls. More...
 
xtd::drawing::point point_to_client (const xtd::drawing::point &p)
 
xtd::drawing::point point_to_screen (const xtd::drawing::point &p)
 
virtual bool pre_process_message (xtd::forms::message &message)
 
virtual std::string product_name () const
 
bool recreating_handle () const
 
virtual void refresh () const
 
void resume_layout ()
 Resumes usual layout logic. More...
 
void resume_layout (bool perform_layout)
 Resumes usual layout logic, optionally forcing an immediate layout of pending layout requests. More...
 
virtual int32_t right () const
 
list_controlselected_index (size_t selected_index) override
 When overridden in a derived class, Sets the zero-based index of the currently selected item. More...
 
virtual size_t selected_index () const
 Gets the zero-based index of the currently selected item. More...
 
const item & selected_item () const
 
combo_boxselected_item (const item &selected_item)
 
intptr_t send_message (intptr_t hwnd, int32_t msg, intptr_t wparam, intptr_t lparam) const
 
void set_auto_size_mode (auto_size_mode auto_size_mode)
 
void set_bounds (int32_t x, int32_t y, int32_t width, int32_t height)
 
void set_bounds (int32_t x, int32_t y, int32_t width, int32_t height, bounds_specified specified)
 
virtual void show ()
 
virtual const drawing::sizesize () const
 
virtual controlsize (const drawing::size &size)
 
virtual bool sorted () const
 
virtual combo_boxsorted (bool sorted)
 
void suspend_layout ()
 Temporarily suspends the layout logic for the control. More...
 
virtual std::any tag () const
 Gets the object that contains data about the control. More...
 
virtual controltag (std::any tag)
 Sets the object that contains data about the control. More...
 
controltext (const std::string &text) override
 
virtual const std::string & text () const
 
virtual std::string to_string () const
 
virtual int32_t top () const
 
virtual controltop (int32_t top)
 
virtual std::optional< control_reftop_level_control () const
 
virtual void update () const
 
virtual std::string value_member () const
 
virtual list_controlvalue_member (const std::string &value_member)
 
virtual bool visible () const
 
virtual controlvisible (bool visible)
 
virtual int32_t width () const
 
virtual controlwidth (int32_t width)
 

Static Public Member Functions

template<typename control_t >
static std::unique_ptr< control_t > create (const drawing::point &location={-1, -1}, const drawing::size &size={-1, -1}, const drawing::color &back_color=drawing::color::empty, const drawing::color &fore_color=drawing::color::empty)
 
template<typename control_t >
static std::unique_ptr< control_t > create (const control &parent, const drawing::point &location={-1, -1}, const drawing::size &size={-1, -1}, const drawing::color &back_color=drawing::color::empty, const drawing::color &fore_color=drawing::color::empty)
 
template<typename control_t >
static std::unique_ptr< control_t > create (const std::string &text, const drawing::point &location={-1, -1}, const drawing::size &size={-1, -1}, const drawing::color &back_color=drawing::color::empty, const drawing::color &fore_color=drawing::color::empty)
 
template<typename control_t >
static std::unique_ptr< control_t > create (const control &parent, const std::string &text, const drawing::point &location={-1, -1}, const drawing::size &size={-1, -1}, const drawing::color &back_color=drawing::color::empty, const drawing::color &fore_color=drawing::color::empty)
 
static std::optional< control_reffrom_child_handle (intptr_t handle)
 
static std::optional< control_reffrom_handle (intptr_t handle)
 
static forms::keys modifier_keys ()
 
static forms::mouse_buttons mouse_buttons ()
 

Public Attributes

event< control, event_handler< control & > > auto_size_changed
 
event< control, event_handler< control & > > back_color_changed
 
event< control, event_handler< control & > > click
 
event< control, event_handler< control & > > client_size_changed
 
event< control, control_event_handler< control & > > control_added
 
event< control, control_event_handler< control & > > control_removed
 
event< control, event_handler< control & > > cursor_changed
 
event< control, event_handler< control & > > dock_changed
 
event< control, event_handler< control & > > double_click
 
event< combo_box, event_handler< control & > > drop_down_style_changed
 
event< control, event_handler< control & > > enabled_changed
 
event< control, event_handler< control & > > font_changed
 
event< control, event_handler< control & > > fore_color_changed
 
event< control, event_handler< control & > > got_focus
 
event< control, event_handler< control & > > handle_created
 
event< control, event_handler< control & > > handle_destroyed
 
event< control, key_event_handler< control & > > key_down
 
event< control, key_press_event_handler< control & > > key_press
 
event< control, key_event_handler< control & > > key_up
 
event< control, event_handler< control & > > layout
 Occurs when a control should reposition its child controls. More...
 
event< control, event_handler< control & > > location_changed
 
event< control, event_handler< control & > > lost_focus
 
event< control, mouse_event_handler< control & > > mouse_click
 
event< control, mouse_event_handler< control & > > mouse_double_click
 
event< control, mouse_event_handler< control & > > mouse_down
 
event< control, event_handler< control & > > mouse_enter
 
event< control, mouse_event_handler< control & > > mouse_horizontal_wheel
 
event< control, event_handler< control & > > mouse_leave
 
event< control, mouse_event_handler< control & > > mouse_move
 
event< control, mouse_event_handler< control & > > mouse_up
 
event< control, mouse_event_handler< control & > > mouse_wheel
 
event< control, paint_event_handler< control & > > paint
 
event< control, event_handler< control & > > parent_changed
 
event< control, event_handler< control & > > resize
 
event< list_control, event_handler< control & > > selected_index_changed
 
event< list_control, event_handler< control & > > selected_value_changed
 
event< control, event_handler< control & > > size_changed
 
event< control, event_handler< control & > > text_changed
 
event< list_control, event_handler< control & > > value_member_changed
 
event< control, event_handler< control & > > visible_changed
 

Static Public Attributes

static const size_t npos = std::numeric_limits<size_t>::max()
 

Protected Member Functions

virtual bool allow_selection ()
 Gets a value indicating whether the list enables selection of list items. More...
 
forms::create_params create_params () const override
 
virtual void def_wnd_proc (message &message)
 
virtual drawing::color default_back_color () const override
 Gets the default background color of the control. More...
 
virtual drawing::color default_fore_color () const override
 
bool design_mode () const
 Gets a value that indicates whether the component is currently in design mode. More...
 
bool get_style (control_styles flag) const
 Retrieves the value of the specified control style bit for the control. More...
 
virtual drawing::size measure_control () const
 Measure this control. More...
 
drawing::size measure_text () const
 
virtual void on_auto_size_changed (const event_args &e)
 
virtual void on_back_color_changed (const event_args &e)
 
virtual void on_click (const event_args &e)
 
virtual void on_client_size_changed (const event_args &e)
 
virtual void on_control_added (const control_event_args &e)
 
virtual void on_control_removed (const control_event_args &e)
 
virtual void on_create_control ()
 
virtual void on_cursor_changed (const event_args &e)
 
virtual void on_dock_changed (const event_args &e)
 
virtual void on_double_click (const event_args &e)
 
virtual void on_drop_down_style_changed (const event_args &e)
 
virtual void on_enabled_changed (const event_args &e)
 
virtual void on_font_changed (const event_args &e)
 
virtual void on_fore_color_changed (const event_args &e)
 
virtual void on_got_focus (const event_args &e)
 
void on_handle_created (const event_args &e) override
 
virtual void on_handle_destroyed (const event_args &e)
 
virtual void on_key_down (key_event_args &e)
 
virtual void on_key_press (key_press_event_args &e)
 
virtual void on_key_up (key_event_args &e)
 
virtual void on_layout (const event_args &e)
 
virtual void on_location_changed (const event_args &e)
 
virtual void on_lost_focus (const event_args &e)
 
virtual void on_mouse_click (const mouse_event_args &e)
 
virtual void on_mouse_double_click (const mouse_event_args &e)
 
virtual void on_mouse_down (const mouse_event_args &e)
 
virtual void on_mouse_enter (const event_args &e)
 
virtual void on_mouse_horizontal_wheel (const mouse_event_args &e)
 
virtual void on_mouse_leave (const event_args &e)
 
virtual void on_mouse_move (const mouse_event_args &e)
 
virtual void on_mouse_up (const mouse_event_args &e)
 
virtual void on_mouse_wheel (const mouse_event_args &e)
 
virtual void on_paint (paint_event_args &e)
 
virtual void on_parent_back_color_changed (const event_args &e)
 
virtual void on_parent_changed (const event_args &e)
 
virtual void on_parent_cursor_changed (const event_args &e)
 
virtual void on_parent_font_changed (const event_args &e)
 
virtual void on_parent_fore_color_changed (const event_args &e)
 
virtual void on_resize (const event_args &e)
 
virtual void on_selected_index_changed (const event_args &e)
 
void on_selected_value_changed (const event_args &e) override
 
virtual void on_size_changed (const event_args &e)
 
virtual void on_text_changed (const event_args &e)
 
virtual void on_value_member_changed (const event_args &e)
 
virtual void on_visible_changed (const event_args &e)
 
virtual void recreate_handle ()
 
void set_bounds_core (int32_t x, int32_t y, int32_t width, int32_t height, bounds_specified specified) override
 Performs the work of setting the specified bounds of this control. More...
 
void set_client_size_core (int32_t width, int32_t height) override
 Sets the size of the client area of the control. More...
 
void set_style (control_styles flag, bool value)
 Sets a specified control_styles flag to either true or false. More...
 
virtual void wm_mouse_double_click (message &message)
 
virtual void wm_mouse_down (message &message)
 
virtual void wm_mouse_up (message &message)
 
virtual void wm_reflect_command (message &message)
 
void wnd_proc (message &message) override
 Processes Windows messages. More...
 

Protected Attributes

int32_t drop_down_height_ = 0
 
combo_box_style drop_down_style_ = combo_box_style::drop_down
 
int32_t drop_down_width_ = 0
 
item_collection items_
 
item selected_item_
 
bool sorted_ = false
 
bool user_set_size_ = false
 

Detailed Description

Represents a Windows combo box control.

Remarks
A combo_box displays a text box combined with a list_box, which enables the user to select items from the list or enter a new value.
The drop_down_style property specifies whether the list is always displayed or whether the list is displayed in a drop-down. The drop_down_style property also specifies whether the text portion can be edited. See combo_box_style for the available settings and their effects. There is no setting to always display the list and disallow entering a new value. To display a list to which no new values can be added, use a list_box control.
To add or remove objects in the list at run time, use methods of the combo_box.object_collection class (through the items property of the combo_box). You can assign an array of object with the push_range method. The list then displays the default string value for each object. You can add individual objects with thepush method. You can delete items with the erase method or clear the entire list with the clear method.
In addition to display and selection functionality, the combo_box also provides features that enable you to efficiently add items to the combo_box and to find text within the items of the list. With the begin_update and end_update methods, you can add a large number of items to the combo_box without the control being repainted each time an item is added to the list. The find_string and find_string_exact methods enable you to search for an item in the list that contains a specific search string.
You can use these properties to manage the currently selected item in the list, the text property to specify the string displayed in the editing field, the selected_index property to get or set the current item, and the selected_item property to get or set a reference to the object.

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