cef/include/views/cef_view.h

// Copyright (c) 2016 Marshall A. Greenblatt. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// ---------------------------------------------------------------------------
//
// The contents of this file must follow a specific format in order to
// support the CEF translator tool. See the translator.README.txt file in the
// 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 CefBase {
 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 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. Position is in parent
  // coordinates.
  ///
  /*--cef()--*/
  virtual void SetBounds(const CefRect& bounds) =0;

  ///
  // Returns the bounds (size and position) of this View. Position is in parent
  // coordinates.
  ///
  /*--cef()--*/
  virtual CefRect GetBounds() =0;

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

  ///
  // Sets the size of this View without changing the position.
  ///
  /*--cef()--*/
  virtual void SetSize(const CefSize& size) =0;

  ///
  // Returns the size of this View.
  ///
  /*--cef()--*/
  virtual CefSize GetSize() =0;

  ///
  // Sets the position of this View without changing the size. |position| is in
  // parent coordinates.
  ///
  /*--cef()--*/
  virtual void SetPosition(const CefPoint& position) =0;

  ///
  // Returns the position of this View. Position is in parent coordinates.
  ///
  /*--cef()--*/
  virtual CefPoint GetPosition() =0;

  ///
  // Returns the size this View would like to be if enough space is available.
  ///
  /*--cef()--*/
  virtual CefSize GetPreferredSize() =0;

  ///
  // Size this View to its preferred size.
  ///
  /*--cef()--*/
  virtual void SizeToPreferredSize() =0;

  ///
  // Returns the minimum size for this View.
  ///
  /*--cef()--*/
  virtual CefSize GetMinimumSize() =0;

  ///
  // Returns the maximum size for this View.
  ///
  /*--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.
  ///
  /*--cef()--*/
  virtual void SetBackgroundColor(cef_color_t color) =0;

  ///
  // Returns the background color for this View.
  ///
  /*--cef()--*/
  virtual cef_color_t GetBackgroundColor() =0;

  ///
  // Convert |point| from this View's coordinate system to that of the screen.
  // 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 that of the screen.
  // 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_