cef/include/views/cef_view.h

// Copyright (c) 2016 Marshall A. Greenblatt. All rights reserved.
//
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//
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// tools directory for more information.
//

#ifndef CEF_INCLUDE_VIEWS_CEF_VIEW_H_
#define CEF_INCLUDE_VIEWS_CEF_VIEW_H_
#pragma once

#include "include/views/cef_view_delegate.h"

class CefBrowserView;
class CefButton;
class CefPanel;
class CefScrollView;
class CefTextfield;
class CefWindow;

///
/// A View is a rectangle within the views View hierarchy. It is the base class
/// for all Views. All size and position values are in density independent
/// pixels (DIP) unless otherwise indicated. Methods must be called on the
/// browser process UI thread unless otherwise indicated.
///
/*--cef(source=library)--*/
class CefView : public CefBaseRefCounted {
 public:
  ///
  /// Returns this View as a BrowserView or NULL if this is not a BrowserView.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefBrowserView> AsBrowserView() = 0;

  ///
  /// Returns this View as a Button or NULL if this is not a Button.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefButton> AsButton() = 0;

  ///
  /// Returns this View as a Panel or NULL if this is not a Panel.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefPanel> AsPanel() = 0;

  ///
  /// Returns this View as a ScrollView or NULL if this is not a ScrollView.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefScrollView> AsScrollView() = 0;

  ///
  /// Returns this View as a Textfield or NULL if this is not a Textfield.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefTextfield> AsTextfield() = 0;

  ///
  /// Returns the type of this View as a string. Used primarily for testing
  /// purposes.
  ///
  /*--cef()--*/
  virtual CefString GetTypeString() = 0;

  ///
  /// Returns a string representation of this View which includes the type and
  /// various type-specific identifying attributes. If |include_children| is
  /// true any child Views will also be included. Used primarily for testing
  /// purposes.
  ///
  /*--cef()--*/
  virtual CefString ToString(bool include_children) = 0;

  ///
  /// Returns true if this View is valid.
  ///
  /*--cef()--*/
  virtual bool IsValid() = 0;

  ///
  /// Returns true if this View is currently attached to another View. A View
  /// can only be attached to one View at a time.
  ///
  /*--cef()--*/
  virtual bool IsAttached() = 0;

  ///
  /// Returns true if this View is the same as |that| View.
  ///
  /*--cef()--*/
  virtual bool IsSame(CefRefPtr<CefView> that) = 0;

  ///
  /// Returns the delegate associated with this View, if any.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefViewDelegate> GetDelegate() = 0;

  ///
  /// Returns the top-level Window hosting this View, if any.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefWindow> GetWindow() = 0;

  ///
  /// Returns the ID for this View.
  ///
  /*--cef()--*/
  virtual int GetID() = 0;

  ///
  /// Sets the ID for this View. ID should be unique within the subtree that you
  /// intend to search for it. 0 is the default ID for views.
  ///
  /*--cef()--*/
  virtual void SetID(int id) = 0;

  ///
  /// Returns the group id of this View, or -1 if not set.
  ///
  /*--cef()--*/
  virtual int GetGroupID() = 0;

  ///
  /// A group id is used to tag Views which are part of the same logical group.
  /// Focus can be moved between views with the same group using the arrow keys.
  /// The group id is immutable once it's set.
  ///
  /*--cef()--*/
  virtual void SetGroupID(int group_id) = 0;

  ///
  /// Returns the View that contains this View, if any.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefView> GetParentView() = 0;

  ///
  /// Recursively descends the view tree starting at this View, and returns the
  /// first child that it encounters with the given ID. Returns NULL if no
  /// matching child view is found.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefView> GetViewForID(int id) = 0;

  ///
  /// Sets the bounds (size and position) of this View. |bounds| is in parent
  /// coordinates, or DIP screen coordinates if there is no parent.
  ///
  /*--cef()--*/
  virtual void SetBounds(const CefRect& bounds) = 0;

  ///
  /// Returns the bounds (size and position) of this View in parent coordinates,
  /// or DIP screen coordinates if there is no parent.
  ///
  /*--cef()--*/
  virtual CefRect GetBounds() = 0;

  ///
  /// Returns the bounds (size and position) of this View in DIP screen
  /// coordinates.
  ///
  /*--cef()--*/
  virtual CefRect GetBoundsInScreen() = 0;

  ///
  /// Sets the size of this View without changing the position. |size| in
  /// parent coordinates, or DIP screen coordinates if there is no parent.
  ///
  /*--cef()--*/
  virtual void SetSize(const CefSize& size) = 0;

  ///
  /// Returns the size of this View in parent coordinates, or DIP screen
  /// coordinates if there is no parent.
  ///
  /*--cef()--*/
  virtual CefSize GetSize() = 0;

  ///
  /// Sets the position of this View without changing the size. |position| is in
  /// parent coordinates, or DIP screen coordinates if there is no parent.
  ///
  /*--cef()--*/
  virtual void SetPosition(const CefPoint& position) = 0;

  ///
  /// Returns the position of this View. Position is in parent coordinates, or
  /// DIP screen coordinates if there is no parent.
  ///
  /*--cef()--*/
  virtual CefPoint GetPosition() = 0;

  ///
  /// Sets the insets for this View. |insets| is in parent coordinates, or DIP
  /// screen coordinates if there is no parent.
  ///
  /*--cef()--*/
  virtual void SetInsets(const CefInsets& insets) = 0;

  ///
  /// Returns the insets for this View in parent coordinates, or DIP screen
  /// coordinates if there is no parent.
  ///
  /*--cef()--*/
  virtual CefInsets GetInsets() = 0;

  ///
  /// Returns the size this View would like to be if enough space is available.
  /// Size is in parent coordinates, or DIP screen coordinates if there is no
  /// parent.
  ///
  /*--cef()--*/
  virtual CefSize GetPreferredSize() = 0;

  ///
  /// Size this View to its preferred size. Size is in parent coordinates, or
  /// DIP screen coordinates if there is no parent.
  ///
  /*--cef()--*/
  virtual void SizeToPreferredSize() = 0;

  ///
  /// Returns the minimum size for this View. Size is in parent coordinates, or
  /// DIP screen coordinates if there is no parent.
  ///
  /*--cef()--*/
  virtual CefSize GetMinimumSize() = 0;

  ///
  /// Returns the maximum size for this View. Size is in parent coordinates, or
  /// DIP screen coordinates if there is no parent.
  ///
  /*--cef()--*/
  virtual CefSize GetMaximumSize() = 0;

  ///
  /// Returns the height necessary to display this View with the provided width.
  ///
  /*--cef()--*/
  virtual int GetHeightForWidth(int width) = 0;

  ///
  /// Indicate that this View and all parent Views require a re-layout. This
  /// ensures the next call to Layout() will propagate to this View even if the
  /// bounds of parent Views do not change.
  ///
  /*--cef()--*/
  virtual void InvalidateLayout() = 0;

  ///
  /// Sets whether this View is visible. Windows are hidden by default and other
  /// views are visible by default. This View and any parent views must be set
  /// as visible for this View to be drawn in a Window. If this View is set as
  /// hidden then it and any child views will not be drawn and, if any of those
  /// views currently have focus, then focus will also be cleared. Painting is
  /// scheduled as needed. If this View is a Window then calling this method is
  /// equivalent to calling the Window Show() and Hide() methods.
  ///
  /*--cef()--*/
  virtual void SetVisible(bool visible) = 0;

  ///
  /// Returns whether this View is visible. A view may be visible but still not
  /// drawn in a Window if any parent views are hidden. If this View is a Window
  /// then a return value of true indicates that this Window is currently
  /// visible to the user on-screen. If this View is not a Window then call
  /// IsDrawn() to determine whether this View and all parent views are visible
  /// and will be drawn.
  ///
  /*--cef()--*/
  virtual bool IsVisible() = 0;

  ///
  /// Returns whether this View is visible and drawn in a Window. A view is
  /// drawn if it and all parent views are visible. If this View is a Window
  /// then calling this method is equivalent to calling IsVisible(). Otherwise,
  /// to determine if the containing Window is visible to the user on-screen
  /// call IsVisible() on the Window.
  ///
  /*--cef()--*/
  virtual bool IsDrawn() = 0;

  ///
  /// Set whether this View is enabled. A disabled View does not receive
  /// keyboard or mouse inputs. If |enabled| differs from the current value the
  /// View will be repainted. Also, clears focus if the focused View is
  /// disabled.
  ///
  /*--cef()--*/
  virtual void SetEnabled(bool enabled) = 0;

  ///
  /// Returns whether this View is enabled.
  ///
  /*--cef()--*/
  virtual bool IsEnabled() = 0;

  ///
  /// Sets whether this View is capable of taking focus. It will clear focus if
  /// the focused View is set to be non-focusable. This is false by default so
  /// that a View used as a container does not get the focus.
  ///
  /*--cef()--*/
  virtual void SetFocusable(bool focusable) = 0;

  ///
  /// Returns true if this View is focusable, enabled and drawn.
  ///
  /*--cef()--*/
  virtual bool IsFocusable() = 0;

  ///
  /// Return whether this View is focusable when the user requires full keyboard
  /// access, even though it may not be normally focusable.
  ///
  /*--cef()--*/
  virtual bool IsAccessibilityFocusable() = 0;

  ///
  /// Request keyboard focus. If this View is focusable it will become the
  /// focused View.
  ///
  /*--cef()--*/
  virtual void RequestFocus() = 0;

  ///
  /// Sets the background color for this View. The background color will be
  /// automatically reset when CefViewDelegate::OnThemeChanged is called.
  ///
  /*--cef()--*/
  virtual void SetBackgroundColor(cef_color_t color) = 0;

  ///
  /// Returns the background color for this View. If the background color is
  /// unset then the current `GetThemeColor(CEF_ColorPrimaryBackground)` value
  /// will be returned. If this View belongs to an overlay (created with
  /// CefWindow::AddOverlayView), and the background color is unset, then a
  /// value of transparent (0) will be returned.
  ///
  /*--cef()--*/
  virtual cef_color_t GetBackgroundColor() = 0;

  ///
  /// Returns the current theme color associated with |color_id|, or the
  /// placeholder color (red) if unset. See cef_color_ids.h for standard ID
  /// values. Standard colors can be overridden and custom colors can be added
  /// using CefWindow::SetThemeColor.
  ///
  /*--cef()--*/
  virtual cef_color_t GetThemeColor(int color_id) = 0;

  ///
  /// Convert |point| from this View's coordinate system to DIP screen
  /// coordinates. This View must belong to a Window when calling this method.
  /// Returns true if the conversion is successful or false otherwise. Use
  /// CefDisplay::ConvertPointToPixels() after calling this method if further
  /// conversion to display-specific pixel coordinates is desired.
  ///
  /*--cef()--*/
  virtual bool ConvertPointToScreen(CefPoint& point) = 0;

  ///
  /// Convert |point| to this View's coordinate system from DIP screen
  /// coordinates. This View must belong to a Window when calling this method.
  /// Returns true if the conversion is successful or false otherwise. Use
  /// CefDisplay::ConvertPointFromPixels() before calling this method if
  /// conversion from display-specific pixel coordinates is necessary.
  ///
  /*--cef()--*/
  virtual bool ConvertPointFromScreen(CefPoint& point) = 0;

  ///
  /// Convert |point| from this View's coordinate system to that of the Window.
  /// This View must belong to a Window when calling this method. Returns true
  /// if the conversion is successful or false otherwise.
  ///
  /*--cef()--*/
  virtual bool ConvertPointToWindow(CefPoint& point) = 0;

  ///
  /// Convert |point| to this View's coordinate system from that of the Window.
  /// This View must belong to a Window when calling this method. Returns true
  /// if the conversion is successful or false otherwise.
  ///
  /*--cef()--*/
  virtual bool ConvertPointFromWindow(CefPoint& point) = 0;

  ///
  /// Convert |point| from this View's coordinate system to that of |view|.
  /// |view| needs to be in the same Window but not necessarily the same view
  /// hierarchy. Returns true if the conversion is successful or false
  /// otherwise.
  ///
  /*--cef()--*/
  virtual bool ConvertPointToView(CefRefPtr<CefView> view, CefPoint& point) = 0;

  ///
  /// Convert |point| to this View's coordinate system from that |view|. |view|
  /// needs to be in the same Window but not necessarily the same view
  /// hierarchy. Returns true if the conversion is successful or false
  /// otherwise.
  ///
  /*--cef()--*/
  virtual bool ConvertPointFromView(CefRefPtr<CefView> view,
                                    CefPoint& point) = 0;
};

#endif  // CEF_INCLUDE_VIEWS_CEF_VIEW_H_