guard against nullptr

[wxWidgets.git] / src / cocoa / combobox.mm

/////////////////////////////////////////////////////////////////////////////
// Name:        src/cocoa/combobox.mm
// Purpose:     wxComboBox
// Author:      Ryan Norton
// Modified by:
// Created:     2005/02/16
// RCS-ID:      $Id$
// Copyright:   (c) 2003 David Elliott
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

//
// Impl notes:
// There is no custom data source because doing so unnecessarily sacrifices
// some native autocompletion behaviour (we would have to make our own -
// the SimpleComboBox sample does so in the developer folder that
// comes with OSX).  One reason you might want this would be to have
// only one array or be able to display numbers returned by an NSNumber
// from the methods.
//
// One problem though is that wxCB_SORT isn't implemented...
//
// Also, not sure if it is correctly getting text field events since
// I'm using SetNSComboBox instead of SetNSTextField
//
// doWxEvent is really hackish... but since there's only one event...
//
// Ideas for future improvement - other notes:
// Combox w/o wxCB_DROPDOWN doesn't seem to be implementable
//wxCB_READONLY  Same as wxCB_DROPDOWN but only the strings specified as the combobox choices can be selected, it is impossible to select (even from a program) a string which is not in the choices list.
//wxCB_SORT      is possible with data source
//
// setIntercellSpacing:/setItemHeight: to autoadjust to number of inserted items?
//
/*
    //example of autocompletion from SimpleComboBox Example
    // ==========================================================
// Combo box data source methods
// ==========================================================

- (int)numberOfItemsInComboBox:(NSComboBox *)aComboBox {
    return [genres count];
}
- (id)comboBox:(NSComboBox *)aComboBox objectValueForItemAtIndex:(int)index {
    return [genres objectAtIndex:index];
}
- (unsigned int)comboBox:(NSComboBox *)aComboBox indexOfItemWithStringValue:(NSString *)string {
    return [genres indexOfObject: string];
}

- (NSString *) firstGenreMatchingPrefix:(NSString *)prefix {
    NSString *string = nil;
    NSString *lowercasePrefix = [prefix lowercaseString];
    NSEnumerator *stringEnum = [genres objectEnumerator];
    while ((string = [stringEnum nextObject])) {
        if ([[string lowercaseString] hasPrefix: lowercasePrefix]) return string;
    }
    return nil;
}

- (NSString *)comboBox:(NSComboBox *)aComboBox completedString:(NSString *)inputString {
    // This method is received after each character typed by the user, because we have checked the "completes" flag for genreComboBox in IB.
    // Given the inputString the user has typed, see if we can find a genre with the prefix, and return it as the suggested complete string.
    NSString *candidate = [self firstGenreMatchingPrefix: inputString];
    return (candidate ? candidate : inputString);
}
*/

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#include "wx/wxprec.h"

#if wxUSE_COMBOBOX

#include "wx/combobox.h"

#include "wx/cocoa/objc/objc_uniquifying.h"

#ifndef WX_PRECOMP
    #include "wx/window.h"
    #include "wx/log.h"
    #include "wx/app.h"
#endif // WX_PRECOMP

#import <AppKit/NSComboBox.h>
#import <Foundation/NSNotification.h>
#import <Foundation/NSString.h>

// ----------------------------------------------------------------------------
// globals
// ----------------------------------------------------------------------------
WX_IMPLEMENT_OBJC_INTERFACE_HASHMAP(NSComboBox)

void wxCocoaNSComboBox::AssociateNSComboBox(WX_NSComboBox cocoaNSComboBox)
{
    if(cocoaNSComboBox)
    {
        sm_cocoaHash.insert(wxCocoaNSComboBoxHash::value_type(cocoaNSComboBox,this));

        [[NSNotificationCenter defaultCenter] addObserver:(id)cocoaNSComboBox selector:@selector(comboBoxSelectionDidChange:) name:@"NSComboBoxSelectionDidChangeNotification" object:cocoaNSComboBox];
        [[NSNotificationCenter defaultCenter] addObserver:(id)cocoaNSComboBox selector:@selector(comboBoxSelectionDidChange:) name:@"NSComboBoxSelectionIsChangingNotification" object:cocoaNSComboBox];
        [[NSNotificationCenter defaultCenter] addObserver:(id)cocoaNSComboBox selector:@selector(comboBoxSelectionDidChange:) name:@"NSComboBoxWillDismissNotification" object:cocoaNSComboBox];
        [[NSNotificationCenter defaultCenter] addObserver:(id)cocoaNSComboBox selector:@selector(comboBoxSelectionDidChange:) name:@"NSComboBoxWillPopUpNotification" object:cocoaNSComboBox];
    }
}

void wxCocoaNSComboBox::DisassociateNSComboBox(WX_NSComboBox cocoaNSComboBox)
{
    if(cocoaNSComboBox)
    {
        sm_cocoaHash.erase(cocoaNSComboBox);
        [[NSNotificationCenter defaultCenter] removeObserver:(id)cocoaNSComboBox name:@"NSComboBoxSelectionDidChangeNotification" object:cocoaNSComboBox];
        [[NSNotificationCenter defaultCenter] removeObserver:(id)cocoaNSComboBox name:@"NSComboBoxSelectionIsChangingNotification" object:cocoaNSComboBox];
        [[NSNotificationCenter defaultCenter] removeObserver:(id)cocoaNSComboBox name:@"NSComboBoxWillDismissNotification" object:cocoaNSComboBox];
        [[NSNotificationCenter defaultCenter] removeObserver:(id)cocoaNSComboBox name:@"NSComboBoxWillPopUpNotification" object:cocoaNSComboBox];
    }
}

// ============================================================================
// @class wxPoserNSComboBox
// ============================================================================
@interface wxPoserNSComboBox : NSComboBox
{
}

- (void)comboBoxSelectionDidChange:(NSNotification *)notification;
- (void)comboBoxSelectionIsChanging:(NSNotification *)notification;
- (void)comboBoxWillDismiss:(NSNotification *)notification;
- (void)comboBoxWillPopUp:(NSNotification *)notification;
@end // wxPoserNSComboBox
WX_DECLARE_GET_OBJC_CLASS(wxPoserNSComboBox,NSComboBox)

//WX_IMPLEMENT_POSER(wxPoserNSComboBox);
@implementation wxPoserNSComboBox : NSComboBox

- (void)comboBoxSelectionDidChange:(NSNotification *)notification
{
    wxCocoaNSComboBox *win = wxCocoaNSComboBox::GetFromCocoa(self);
    win->doWxEvent(wxEVT_COMMAND_COMBOBOX_SELECTED);
}

- (void)comboBoxSelectionIsChanging:(NSNotification *)notification
{
    //...
}

- (void)comboBoxWillDismiss:(NSNotification *)notification
{
    //...
}

- (void)comboBoxWillPopUp:(NSNotification *)notification
{
    //...
}

@end // implementation wxPoserNSComboBox
WX_IMPLEMENT_GET_OBJC_CLASS(wxPoserNSComboBox,NSComboBox)

#include "wx/cocoa/autorelease.h"
#include "wx/cocoa/string.h"

#import <AppKit/NSComboBox.h>

BEGIN_EVENT_TABLE(wxComboBox, wxControl)
END_EVENT_TABLE()
WX_IMPLEMENT_COCOA_OWNER(wxComboBox,NSComboBox,NSTextField,NSView)
WX_IMPLEMENT_COCOA_OWNER(wxComboBox,NSTextField,NSControl,NSView)

bool wxComboBox::Create(wxWindow *parent, wxWindowID winid,
            const wxString& value,
            const wxPoint& pos,
            const wxSize& size,
            const wxArrayString& choices,
            long style,
            const wxValidator& validator,
            const wxString& name)
{
    wxCArrayString chs(choices);

    return Create(parent, winid, value, pos, size, chs.GetCount(),
                  chs.GetStrings(), style, validator, name);
}

bool wxComboBox::Create(wxWindow *parent, wxWindowID winid,
            const wxString& value,
            const wxPoint& pos,
            const wxSize& size,
            int n, const wxString choices[],
            long style,
            const wxValidator& validator,
            const wxString& name)
{
    wxAutoNSAutoreleasePool pool;
    if(!CreateControl(parent,winid,pos,size,style,validator,name))
        return false;

    m_cocoaNSView = NULL;
    SetNSComboBox([[WX_GET_OBJC_CLASS(wxPoserNSComboBox) alloc] initWithFrame:MakeDefaultNSRect(size)]);
    [m_cocoaNSView release];
    [GetNSTextField() setStringValue:wxNSStringWithWxString(value.c_str())];
    [GetNSControl() sizeToFit];
    if(m_parent)
        m_parent->CocoaAddChild(this);
    SetInitialFrameRect(pos,size);

    wxComboBox::Append(n, choices);

    [GetNSComboBox() setCompletes:true]; //autocomplete :)

    return true;
}

wxComboBox::~wxComboBox()
{
    DisassociateNSComboBox(GetNSComboBox());
}

void wxComboBox::doWxEvent(int nEvent)
{
    wxCommandEvent event2(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId() );
    event2.SetInt(GetSelection());
    event2.SetEventObject(this);
    event2.SetString(GetStringSelection());
    HandleWindowEvent(event2);

    // For consistency with MSW and GTK, also send a text updated event
    // After all, the text is updated when a selection is made
    wxCommandEvent TextEvent( wxEVT_COMMAND_TEXT_UPDATED, GetId() );
    TextEvent.SetString( GetStringSelection() );
    TextEvent.SetEventObject( this );
    HandleWindowEvent( TextEvent );
}


void wxComboBox::SetSelection(int nSelection)
{
    [GetNSComboBox() selectItemAtIndex:nSelection];
}

wxString wxComboBox::GetStringSelection()
{
    return wxStringWithNSString([GetNSComboBox() objectValueOfSelectedItem]);
}

void wxComboBox::DoClear()
{
    [GetNSComboBox() removeAllItems];
    m_Datas.Clear();
}

void wxComboBox::DoDeleteOneItem(unsigned int n)
{
    [GetNSComboBox() removeItemAtIndex:n];
    m_Datas.RemoveAt(n);
}

unsigned int wxComboBox::GetCount() const
{
    return (unsigned int)[GetNSComboBox() numberOfItems];
}

wxString wxComboBox::GetString(unsigned int nIndex) const
{
    return wxStringWithNSString([GetNSComboBox() itemObjectValueAtIndex:nIndex]);
}

void wxComboBox::SetString(unsigned int nIndex, const wxString& szString)
{
    wxAutoNSAutoreleasePool pool;
    //FIXME:  There appears to be no "set item data" method - maybe
    //an assignment would work?
    [GetNSComboBox() removeItemAtIndex:nIndex];
    [GetNSComboBox() insertItemWithObjectValue:wxNSStringWithWxString(szString) atIndex:nIndex];
}

int wxComboBox::FindString(const wxString& szItem, bool bCase) const
{
    // FIXME: use wxItemContainerImmutable::FindString for bCase parameter
    return [GetNSComboBox() indexOfItemWithObjectValue:wxNSStringWithWxString(szItem)];
}

int wxComboBox::GetSelection() const
{
    return [GetNSComboBox() indexOfSelectedItem];
}

int wxComboBox::DoInsertItems(const wxArrayStringsAdapter& items,
                              unsigned int pos,
                              void **clientData,
                              wxClientDataType type)
{
    wxAutoNSAutoreleasePool pool;
    const unsigned int numITems = items.GetCount();
    for ( unsigned int i = 0; i < numITems; ++i, ++pos )
    {
        [GetNSComboBox() insertItemWithObjectValue:wxNSStringWithWxString(items[i]) atIndex:(pos)];
        m_Datas.Insert(NULL, pos);
        AssignNewItemClientData(pos, clientData, i, type);
    }
    return pos - 1;
}

void wxComboBox::DoSetItemClientData(unsigned int nIndex, void* pData)
{
    m_Datas[nIndex] = pData;
}

void* wxComboBox::DoGetItemClientData(unsigned int nIndex) const
{
    return m_Datas[nIndex];
}

/////////////////////////////////////////////////////////////////////////////
// wxTextEntry virtual implementations:

void wxComboBox::WriteText(wxString const&)
{
}

wxString wxComboBox::GetValue() const
{
    wxAutoNSAutoreleasePool pool;
    return wxStringWithNSString([GetNSTextField() stringValue]);
}

void wxComboBox::Remove(long, long)
{
}

void wxComboBox::Cut()
{
}

void wxComboBox::Copy()
{
}

void wxComboBox::Paste()
{
}

void wxComboBox::Undo()
{
}

void wxComboBox::Redo()
{
}

bool wxComboBox::CanUndo() const
{
    return false;
}

bool wxComboBox::CanRedo() const
{
    return false;
}

void wxComboBox::SetInsertionPoint(long)
{
}

long wxComboBox::GetInsertionPoint() const
{
    return 0;
}

wxTextPos wxComboBox::GetLastPosition() const
{
    // working - returns the size of the wxString
    return (long)(GetValue().Len());
}

void wxComboBox::SetSelection(long, long)
{
}

void wxComboBox::GetSelection(long*, long*) const
{
}

bool wxComboBox::IsEditable() const
{
    return [GetNSTextField() isEditable];
}

void wxComboBox::SetEditable(bool editable)
{
    // first ensure that the current value is stored (in case the user had not finished editing
    // before SetEditable(FALSE) was called)
    DoSetValue(GetValue(),1);

    [GetNSTextField() setEditable: editable];

    // forces the focus on the textctrl to be lost - while focus is still maintained
    // after SetEditable(FALSE) the user may still edit the control
    // (might not the best way to do this..)
    [GetNSTextField() abortEditing];
}

#endif // wxUSE_COMBOBOX