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/usr/include/firefox-esr-52/nsIDocShellTreeOwner.h is in firefox-esr-dev 52.8.1esr-1~deb8u1.

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The actual contents of the file can be viewed below.

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/*
 * DO NOT EDIT.  THIS FILE IS GENERATED FROM ../../../dist/idl/nsIDocShellTreeOwner.idl
 */

#ifndef __gen_nsIDocShellTreeOwner_h__
#define __gen_nsIDocShellTreeOwner_h__


#ifndef __gen_nsISupports_h__
#include "nsISupports.h"
#endif

/* For IDL files that don't want to include root IDL files. */
#ifndef NS_NO_VTABLE
#define NS_NO_VTABLE
#endif
class nsIDocShellTreeItem; /* forward declaration */

class nsITabParent; /* forward declaration */


/* starting interface:    nsIDocShellTreeOwner */
#define NS_IDOCSHELLTREEOWNER_IID_STR "0e3dc4b1-4cea-4a37-af71-79f0afd07574"

#define NS_IDOCSHELLTREEOWNER_IID \
  {0x0e3dc4b1, 0x4cea, 0x4a37, \
    { 0xaf, 0x71, 0x79, 0xf0, 0xaf, 0xd0, 0x75, 0x74 }}

class NS_NO_VTABLE nsIDocShellTreeOwner : public nsISupports {
 public:

  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IDOCSHELLTREEOWNER_IID)

  /* void contentShellAdded (in nsIDocShellTreeItem aContentShell, in boolean aPrimary, in boolean aTargetable, in AString aID); */
  NS_IMETHOD ContentShellAdded(nsIDocShellTreeItem *aContentShell, bool aPrimary, bool aTargetable, const nsAString & aID) = 0;

  /* void contentShellRemoved (in nsIDocShellTreeItem aContentShell); */
  NS_IMETHOD ContentShellRemoved(nsIDocShellTreeItem *aContentShell) = 0;

  /* readonly attribute nsIDocShellTreeItem primaryContentShell; */
  NS_IMETHOD GetPrimaryContentShell(nsIDocShellTreeItem * *aPrimaryContentShell) = 0;

  /* void tabParentAdded (in nsITabParent aTab, in boolean aPrimary); */
  NS_IMETHOD TabParentAdded(nsITabParent *aTab, bool aPrimary) = 0;

  /* void tabParentRemoved (in nsITabParent aTab); */
  NS_IMETHOD TabParentRemoved(nsITabParent *aTab) = 0;

  /* readonly attribute nsITabParent primaryTabParent; */
  NS_IMETHOD GetPrimaryTabParent(nsITabParent * *aPrimaryTabParent) = 0;

  /* void sizeShellTo (in nsIDocShellTreeItem shell, in long cx, in long cy); */
  NS_IMETHOD SizeShellTo(nsIDocShellTreeItem *shell, int32_t cx, int32_t cy) = 0;

  /* void getPrimaryContentSize (out long width, out long height); */
  NS_IMETHOD GetPrimaryContentSize(int32_t *width, int32_t *height) = 0;

  /* void setPrimaryContentSize (in long width, in long height); */
  NS_IMETHOD SetPrimaryContentSize(int32_t width, int32_t height) = 0;

  /* void getRootShellSize (out long width, out long height); */
  NS_IMETHOD GetRootShellSize(int32_t *width, int32_t *height) = 0;

  /* void setRootShellSize (in long width, in long height); */
  NS_IMETHOD SetRootShellSize(int32_t width, int32_t height) = 0;

  /* void setPersistence (in boolean aPersistPosition, in boolean aPersistSize, in boolean aPersistSizeMode); */
  NS_IMETHOD SetPersistence(bool aPersistPosition, bool aPersistSize, bool aPersistSizeMode) = 0;

  /* void getPersistence (out boolean aPersistPosition, out boolean aPersistSize, out boolean aPersistSizeMode); */
  NS_IMETHOD GetPersistence(bool *aPersistPosition, bool *aPersistSize, bool *aPersistSizeMode) = 0;

  /* readonly attribute unsigned long targetableShellCount; */
  NS_IMETHOD GetTargetableShellCount(uint32_t *aTargetableShellCount) = 0;

  /* readonly attribute bool hasPrimaryContent; */
  NS_IMETHOD GetHasPrimaryContent(bool *aHasPrimaryContent) = 0;

};

  NS_DEFINE_STATIC_IID_ACCESSOR(nsIDocShellTreeOwner, NS_IDOCSHELLTREEOWNER_IID)

/* Use this macro when declaring classes that implement this interface. */
#define NS_DECL_NSIDOCSHELLTREEOWNER \
  NS_IMETHOD ContentShellAdded(nsIDocShellTreeItem *aContentShell, bool aPrimary, bool aTargetable, const nsAString & aID) override; \
  NS_IMETHOD ContentShellRemoved(nsIDocShellTreeItem *aContentShell) override; \
  NS_IMETHOD GetPrimaryContentShell(nsIDocShellTreeItem * *aPrimaryContentShell) override; \
  NS_IMETHOD TabParentAdded(nsITabParent *aTab, bool aPrimary) override; \
  NS_IMETHOD TabParentRemoved(nsITabParent *aTab) override; \
  NS_IMETHOD GetPrimaryTabParent(nsITabParent * *aPrimaryTabParent) override; \
  NS_IMETHOD SizeShellTo(nsIDocShellTreeItem *shell, int32_t cx, int32_t cy) override; \
  NS_IMETHOD GetPrimaryContentSize(int32_t *width, int32_t *height) override; \
  NS_IMETHOD SetPrimaryContentSize(int32_t width, int32_t height) override; \
  NS_IMETHOD GetRootShellSize(int32_t *width, int32_t *height) override; \
  NS_IMETHOD SetRootShellSize(int32_t width, int32_t height) override; \
  NS_IMETHOD SetPersistence(bool aPersistPosition, bool aPersistSize, bool aPersistSizeMode) override; \
  NS_IMETHOD GetPersistence(bool *aPersistPosition, bool *aPersistSize, bool *aPersistSizeMode) override; \
  NS_IMETHOD GetTargetableShellCount(uint32_t *aTargetableShellCount) override; \
  NS_IMETHOD GetHasPrimaryContent(bool *aHasPrimaryContent) override; 

/* Use this macro when declaring the members of this interface when the
   class doesn't implement the interface. This is useful for forwarding. */
#define NS_DECL_NON_VIRTUAL_NSIDOCSHELLTREEOWNER \
  NS_METHOD ContentShellAdded(nsIDocShellTreeItem *aContentShell, bool aPrimary, bool aTargetable, const nsAString & aID); \
  NS_METHOD ContentShellRemoved(nsIDocShellTreeItem *aContentShell); \
  NS_METHOD GetPrimaryContentShell(nsIDocShellTreeItem * *aPrimaryContentShell); \
  NS_METHOD TabParentAdded(nsITabParent *aTab, bool aPrimary); \
  NS_METHOD TabParentRemoved(nsITabParent *aTab); \
  NS_METHOD GetPrimaryTabParent(nsITabParent * *aPrimaryTabParent); \
  NS_METHOD SizeShellTo(nsIDocShellTreeItem *shell, int32_t cx, int32_t cy); \
  NS_METHOD GetPrimaryContentSize(int32_t *width, int32_t *height); \
  NS_METHOD SetPrimaryContentSize(int32_t width, int32_t height); \
  NS_METHOD GetRootShellSize(int32_t *width, int32_t *height); \
  NS_METHOD SetRootShellSize(int32_t width, int32_t height); \
  NS_METHOD SetPersistence(bool aPersistPosition, bool aPersistSize, bool aPersistSizeMode); \
  NS_METHOD GetPersistence(bool *aPersistPosition, bool *aPersistSize, bool *aPersistSizeMode); \
  NS_METHOD GetTargetableShellCount(uint32_t *aTargetableShellCount); \
  NS_METHOD GetHasPrimaryContent(bool *aHasPrimaryContent); 

/* Use this macro to declare functions that forward the behavior of this interface to another object. */
#define NS_FORWARD_NSIDOCSHELLTREEOWNER(_to) \
  NS_IMETHOD ContentShellAdded(nsIDocShellTreeItem *aContentShell, bool aPrimary, bool aTargetable, const nsAString & aID) override { return _to ContentShellAdded(aContentShell, aPrimary, aTargetable, aID); } \
  NS_IMETHOD ContentShellRemoved(nsIDocShellTreeItem *aContentShell) override { return _to ContentShellRemoved(aContentShell); } \
  NS_IMETHOD GetPrimaryContentShell(nsIDocShellTreeItem * *aPrimaryContentShell) override { return _to GetPrimaryContentShell(aPrimaryContentShell); } \
  NS_IMETHOD TabParentAdded(nsITabParent *aTab, bool aPrimary) override { return _to TabParentAdded(aTab, aPrimary); } \
  NS_IMETHOD TabParentRemoved(nsITabParent *aTab) override { return _to TabParentRemoved(aTab); } \
  NS_IMETHOD GetPrimaryTabParent(nsITabParent * *aPrimaryTabParent) override { return _to GetPrimaryTabParent(aPrimaryTabParent); } \
  NS_IMETHOD SizeShellTo(nsIDocShellTreeItem *shell, int32_t cx, int32_t cy) override { return _to SizeShellTo(shell, cx, cy); } \
  NS_IMETHOD GetPrimaryContentSize(int32_t *width, int32_t *height) override { return _to GetPrimaryContentSize(width, height); } \
  NS_IMETHOD SetPrimaryContentSize(int32_t width, int32_t height) override { return _to SetPrimaryContentSize(width, height); } \
  NS_IMETHOD GetRootShellSize(int32_t *width, int32_t *height) override { return _to GetRootShellSize(width, height); } \
  NS_IMETHOD SetRootShellSize(int32_t width, int32_t height) override { return _to SetRootShellSize(width, height); } \
  NS_IMETHOD SetPersistence(bool aPersistPosition, bool aPersistSize, bool aPersistSizeMode) override { return _to SetPersistence(aPersistPosition, aPersistSize, aPersistSizeMode); } \
  NS_IMETHOD GetPersistence(bool *aPersistPosition, bool *aPersistSize, bool *aPersistSizeMode) override { return _to GetPersistence(aPersistPosition, aPersistSize, aPersistSizeMode); } \
  NS_IMETHOD GetTargetableShellCount(uint32_t *aTargetableShellCount) override { return _to GetTargetableShellCount(aTargetableShellCount); } \
  NS_IMETHOD GetHasPrimaryContent(bool *aHasPrimaryContent) override { return _to GetHasPrimaryContent(aHasPrimaryContent); } 

/* Use this macro to declare functions that forward the behavior of this interface to another object in a safe way. */
#define NS_FORWARD_SAFE_NSIDOCSHELLTREEOWNER(_to) \
  NS_IMETHOD ContentShellAdded(nsIDocShellTreeItem *aContentShell, bool aPrimary, bool aTargetable, const nsAString & aID) override { return !_to ? NS_ERROR_NULL_POINTER : _to->ContentShellAdded(aContentShell, aPrimary, aTargetable, aID); } \
  NS_IMETHOD ContentShellRemoved(nsIDocShellTreeItem *aContentShell) override { return !_to ? NS_ERROR_NULL_POINTER : _to->ContentShellRemoved(aContentShell); } \
  NS_IMETHOD GetPrimaryContentShell(nsIDocShellTreeItem * *aPrimaryContentShell) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetPrimaryContentShell(aPrimaryContentShell); } \
  NS_IMETHOD TabParentAdded(nsITabParent *aTab, bool aPrimary) override { return !_to ? NS_ERROR_NULL_POINTER : _to->TabParentAdded(aTab, aPrimary); } \
  NS_IMETHOD TabParentRemoved(nsITabParent *aTab) override { return !_to ? NS_ERROR_NULL_POINTER : _to->TabParentRemoved(aTab); } \
  NS_IMETHOD GetPrimaryTabParent(nsITabParent * *aPrimaryTabParent) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetPrimaryTabParent(aPrimaryTabParent); } \
  NS_IMETHOD SizeShellTo(nsIDocShellTreeItem *shell, int32_t cx, int32_t cy) override { return !_to ? NS_ERROR_NULL_POINTER : _to->SizeShellTo(shell, cx, cy); } \
  NS_IMETHOD GetPrimaryContentSize(int32_t *width, int32_t *height) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetPrimaryContentSize(width, height); } \
  NS_IMETHOD SetPrimaryContentSize(int32_t width, int32_t height) override { return !_to ? NS_ERROR_NULL_POINTER : _to->SetPrimaryContentSize(width, height); } \
  NS_IMETHOD GetRootShellSize(int32_t *width, int32_t *height) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetRootShellSize(width, height); } \
  NS_IMETHOD SetRootShellSize(int32_t width, int32_t height) override { return !_to ? NS_ERROR_NULL_POINTER : _to->SetRootShellSize(width, height); } \
  NS_IMETHOD SetPersistence(bool aPersistPosition, bool aPersistSize, bool aPersistSizeMode) override { return !_to ? NS_ERROR_NULL_POINTER : _to->SetPersistence(aPersistPosition, aPersistSize, aPersistSizeMode); } \
  NS_IMETHOD GetPersistence(bool *aPersistPosition, bool *aPersistSize, bool *aPersistSizeMode) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetPersistence(aPersistPosition, aPersistSize, aPersistSizeMode); } \
  NS_IMETHOD GetTargetableShellCount(uint32_t *aTargetableShellCount) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetTargetableShellCount(aTargetableShellCount); } \
  NS_IMETHOD GetHasPrimaryContent(bool *aHasPrimaryContent) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetHasPrimaryContent(aHasPrimaryContent); } 

#if 0
/* Use the code below as a template for the implementation class for this interface. */

/* Header file */
class nsDocShellTreeOwner : public nsIDocShellTreeOwner
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIDOCSHELLTREEOWNER

  nsDocShellTreeOwner();

private:
  ~nsDocShellTreeOwner();

protected:
  /* additional members */
};

/* Implementation file */
NS_IMPL_ISUPPORTS(nsDocShellTreeOwner, nsIDocShellTreeOwner)

nsDocShellTreeOwner::nsDocShellTreeOwner()
{
  /* member initializers and constructor code */
}

nsDocShellTreeOwner::~nsDocShellTreeOwner()
{
  /* destructor code */
}

/* void contentShellAdded (in nsIDocShellTreeItem aContentShell, in boolean aPrimary, in boolean aTargetable, in AString aID); */
NS_IMETHODIMP nsDocShellTreeOwner::ContentShellAdded(nsIDocShellTreeItem *aContentShell, bool aPrimary, bool aTargetable, const nsAString & aID)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void contentShellRemoved (in nsIDocShellTreeItem aContentShell); */
NS_IMETHODIMP nsDocShellTreeOwner::ContentShellRemoved(nsIDocShellTreeItem *aContentShell)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* readonly attribute nsIDocShellTreeItem primaryContentShell; */
NS_IMETHODIMP nsDocShellTreeOwner::GetPrimaryContentShell(nsIDocShellTreeItem * *aPrimaryContentShell)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void tabParentAdded (in nsITabParent aTab, in boolean aPrimary); */
NS_IMETHODIMP nsDocShellTreeOwner::TabParentAdded(nsITabParent *aTab, bool aPrimary)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void tabParentRemoved (in nsITabParent aTab); */
NS_IMETHODIMP nsDocShellTreeOwner::TabParentRemoved(nsITabParent *aTab)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* readonly attribute nsITabParent primaryTabParent; */
NS_IMETHODIMP nsDocShellTreeOwner::GetPrimaryTabParent(nsITabParent * *aPrimaryTabParent)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void sizeShellTo (in nsIDocShellTreeItem shell, in long cx, in long cy); */
NS_IMETHODIMP nsDocShellTreeOwner::SizeShellTo(nsIDocShellTreeItem *shell, int32_t cx, int32_t cy)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void getPrimaryContentSize (out long width, out long height); */
NS_IMETHODIMP nsDocShellTreeOwner::GetPrimaryContentSize(int32_t *width, int32_t *height)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void setPrimaryContentSize (in long width, in long height); */
NS_IMETHODIMP nsDocShellTreeOwner::SetPrimaryContentSize(int32_t width, int32_t height)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void getRootShellSize (out long width, out long height); */
NS_IMETHODIMP nsDocShellTreeOwner::GetRootShellSize(int32_t *width, int32_t *height)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void setRootShellSize (in long width, in long height); */
NS_IMETHODIMP nsDocShellTreeOwner::SetRootShellSize(int32_t width, int32_t height)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void setPersistence (in boolean aPersistPosition, in boolean aPersistSize, in boolean aPersistSizeMode); */
NS_IMETHODIMP nsDocShellTreeOwner::SetPersistence(bool aPersistPosition, bool aPersistSize, bool aPersistSizeMode)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void getPersistence (out boolean aPersistPosition, out boolean aPersistSize, out boolean aPersistSizeMode); */
NS_IMETHODIMP nsDocShellTreeOwner::GetPersistence(bool *aPersistPosition, bool *aPersistSize, bool *aPersistSizeMode)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* readonly attribute unsigned long targetableShellCount; */
NS_IMETHODIMP nsDocShellTreeOwner::GetTargetableShellCount(uint32_t *aTargetableShellCount)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* readonly attribute bool hasPrimaryContent; */
NS_IMETHODIMP nsDocShellTreeOwner::GetHasPrimaryContent(bool *aHasPrimaryContent)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* End of implementation class template. */
#endif


#endif /* __gen_nsIDocShellTreeOwner_h__ */