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33ac7e6f01acbac1cff0ad400d8ea7f0bfd0a62f
wxWidgets/src/msw/button.cpp
Kendall Bennett 33ac7e6f01 Updates to fix Watcom C/C++ 11.0 compiler warning problems. Now compiles 
clean with this compiler. Hopefully I did this without breaking other
compilers.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9967 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2001-05-02 19:48:15 +00:00

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/////////////////////////////////////////////////////////////////////////////
// Name: msw/button.cpp
// Purpose: wxButton
// Author: Julian Smart
// Modified by:
// Created: 04/01/98
// RCS-ID: $Id$
// Copyright: (c) Julian Smart and Markus Holzem
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#ifdef __GNUG__
#pragma implementation "button.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include "wx/button.h"
#include "wx/brush.h"
#include "wx/panel.h"
#include "wx/bmpbuttn.h"
#include "wx/settings.h"
#include "wx/dcscreen.h"
#endif
#include "wx/msw/private.h"
// ----------------------------------------------------------------------------
// macros
// ----------------------------------------------------------------------------
IMPLEMENT_DYNAMIC_CLASS(wxButton, wxControl)
// this macro tries to adjust the default button height to a reasonable value
// using the char height as the base
#define BUTTON_HEIGHT_FROM_CHAR_HEIGHT(cy) (11*EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)/10)
// ============================================================================
// implementation
// ============================================================================
// ----------------------------------------------------------------------------
// creation/destruction
// ----------------------------------------------------------------------------
bool wxButton::Create(wxWindow *parent,
wxWindowID id,
const wxString& label,
const wxPoint& pos,
const wxSize& size,
long style,
const wxValidator& validator,
const wxString& name)
{
if ( !CreateBase(parent, id, pos, size, style, validator, name) )
return FALSE;
parent->AddChild((wxButton *)this);
m_backgroundColour = parent->GetBackgroundColour();
m_foregroundColour = parent->GetForegroundColour();
long msStyle = WS_VISIBLE | WS_TABSTOP | WS_CHILD /* | WS_CLIPSIBLINGS */ ;
#ifdef __WIN32__
if(m_windowStyle & wxBU_LEFT)
msStyle |= BS_LEFT;
if(m_windowStyle & wxBU_RIGHT)
msStyle |= BS_RIGHT;
if(m_windowStyle & wxBU_TOP)
msStyle |= BS_TOP;
if(m_windowStyle & wxBU_BOTTOM)
msStyle |= BS_BOTTOM;
#endif
m_hWnd = (WXHWND)CreateWindowEx
(
MakeExtendedStyle(m_windowStyle),
wxT("BUTTON"),
label,
msStyle,
0, 0, 0, 0,
GetWinHwnd(parent),
(HMENU)m_windowId,
wxGetInstance(),
NULL
);
if (m_hWnd == 0)
{
wxString msg;
#ifdef __WIN16__
msg.Printf(wxT("CreateWindowEx failed"));
#else
msg.Printf(wxT("CreateWindowEx failed with error number %ld"), (long) GetLastError());
#endif
wxFAIL_MSG(msg);
}
// Subclass again for purposes of dialog editing mode
SubclassWin(m_hWnd);
SetFont(parent->GetFont());
SetSize(pos.x, pos.y, size.x, size.y);
return TRUE;
}
wxButton::~wxButton()
{
wxPanel *panel = wxDynamicCast(GetParent(), wxPanel);
if ( panel )
{
if ( panel->GetDefaultItem() == this )
{
// don't leave the panel with invalid default item
panel->SetDefaultItem(NULL);
}
}
}
// ----------------------------------------------------------------------------
// size management including autosizing
// ----------------------------------------------------------------------------
wxSize wxButton::DoGetBestSize() const
{
wxString label = wxGetWindowText(GetHWND());
int wBtn;
GetTextExtent(label, &wBtn, NULL);
int wChar, hChar;
wxGetCharSize(GetHWND(), &wChar, &hChar, &GetFont());
// add a margin - the button is wider than just its label
wBtn += 3*wChar;
// the button height is proportional to the height of the font used
int hBtn = BUTTON_HEIGHT_FROM_CHAR_HEIGHT(hChar);
wxSize sz = GetDefaultSize();
if (wBtn > sz.x) sz.x = wBtn;
if (hBtn > sz.y) sz.y = hBtn;
return sz;
}
/* static */
wxSize wxButton::GetDefaultSize()
{
static wxSize s_sizeBtn;
if ( s_sizeBtn.x == 0 )
{
wxScreenDC dc;
dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
// the size of a standard button in the dialog units is 50x14,
// translate this to pixels
// NB1: the multipliers come from the Windows convention
// NB2: the extra +1/+2 were needed to get the size be the same as the
// size of the buttons in the standard dialog - I don't know how
// this happens, but on my system this size is 75x23 in pixels and
// 23*8 isn't even divisible by 14... Would be nice to understand
// why these constants are needed though!
s_sizeBtn.x = (50 * (dc.GetCharWidth() + 1))/4;
s_sizeBtn.y = ((14 * dc.GetCharHeight()) + 2)/8;
}
return s_sizeBtn;
}
// ----------------------------------------------------------------------------
// set this button as the default one in its panel
// ----------------------------------------------------------------------------
void wxButton::SetDefault()
{
wxWindow *parent = GetParent();
wxButton *btnOldDefault = NULL;
wxPanel *panel = wxDynamicCast(parent, wxPanel);
if ( panel )
{
btnOldDefault = panel->GetDefaultItem();
panel->SetDefaultItem(this);
}
if ( parent )
{
SendMessage(GetWinHwnd(parent), DM_SETDEFID, m_windowId, 0L);
}
if ( btnOldDefault )
{
// remove the BS_DEFPUSHBUTTON style from the other button
long style = GetWindowLong(GetHwndOf(btnOldDefault), GWL_STYLE);
// don't do it with the owner drawn buttons because it will reset
// BS_OWNERDRAW style bit too (BS_OWNERDRAW & BS_DEFPUSHBUTTON != 0)!
if ( (style & BS_OWNERDRAW) != BS_OWNERDRAW )
{
style &= ~BS_DEFPUSHBUTTON;
SendMessage(GetHwndOf(btnOldDefault), BM_SETSTYLE, style, 1L);
}
else
{
// redraw the button - it will notice itself that it's not the
// default one any longer
btnOldDefault->Refresh();
}
}
// set this button as the default
long style = GetWindowLong(GetHwnd(), GWL_STYLE);
if ( (style & BS_OWNERDRAW) != BS_OWNERDRAW )
{
style |= BS_DEFPUSHBUTTON;
SendMessage(GetHwnd(), BM_SETSTYLE, style, 1L);
}
}
// ----------------------------------------------------------------------------
// helpers
// ----------------------------------------------------------------------------
bool wxButton::SendClickEvent()
{
wxCommandEvent event(wxEVT_COMMAND_BUTTON_CLICKED, GetId());
event.SetEventObject(this);
return ProcessCommand(event);
}
void wxButton::Command(wxCommandEvent & event)
{
ProcessCommand(event);
}
// ----------------------------------------------------------------------------
// event/message handlers
// ----------------------------------------------------------------------------
bool wxButton::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
{
bool processed = FALSE;
switch ( param )
{
case 1: // message came from an accelerator
case BN_CLICKED: // normal buttons send this
case BN_DOUBLECLICKED: // owner-drawn ones also send this
processed = SendClickEvent();
break;
}
return processed;
}
long wxButton::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
{
// when we receive focus, we want to become the default button in our
// parent panel
if ( nMsg == WM_SETFOCUS )
{
SetDefault();
// let the default processign take place too
}
else if ( nMsg == WM_LBUTTONDBLCLK )
{
// emulate a click event to force an owner-drawn button to change its
// appearance - without this, it won't do it
(void)wxControl::MSWWindowProc(WM_LBUTTONDOWN, wParam, lParam);
// and conitnue with processing the message normally as well
}
// let the base class do all real processing
return wxControl::MSWWindowProc(nMsg, wParam, lParam);
}
// ----------------------------------------------------------------------------
// owner-drawn buttons support
// ----------------------------------------------------------------------------
#ifdef __WIN32__
// drawing helpers
static void DrawButtonText(HDC hdc,
RECT *pRect,
const wxString& text,
COLORREF col)
{
COLORREF colOld = SetTextColor(hdc, col);
int modeOld = SetBkMode(hdc, TRANSPARENT);
DrawText(hdc, text, text.length(), pRect,
DT_CENTER | DT_VCENTER | DT_SINGLELINE);
SetBkMode(hdc, modeOld);
SetTextColor(hdc, colOld);
}
static void DrawRect(HDC hdc, const RECT& r)
{
MoveToEx(hdc, r.left, r.top, NULL);
LineTo(hdc, r.right, r.top);
LineTo(hdc, r.right, r.bottom);
LineTo(hdc, r.left, r.bottom);
LineTo(hdc, r.left, r.top);
}
void wxButton::MakeOwnerDrawn()
{
long style = GetWindowLong(GetHwnd(), GWL_STYLE);
if ( (style & BS_OWNERDRAW) != BS_OWNERDRAW )
{
// make it so
style |= BS_OWNERDRAW;
SetWindowLong(GetHwnd(), GWL_STYLE, style);
}
}
bool wxButton::SetBackgroundColour(const wxColour &colour)
{
if ( !wxControl::SetBackgroundColour(colour) )
{
// nothing to do
return FALSE;
}
MakeOwnerDrawn();
Refresh();
return TRUE;
}
bool wxButton::SetForegroundColour(const wxColour &colour)
{
if ( !wxControl::SetForegroundColour(colour) )
{
// nothing to do
return FALSE;
}
MakeOwnerDrawn();
Refresh();
return TRUE;
}
/*
The button frame looks like this normally:
WWWWWWWWWWWWWWWWWWB
WHHHHHHHHHHHHHHHHGB W = white (HILIGHT)
WH GB H = light grey (LIGHT)
WH GB G = dark grey (SHADOW)
WH GB B = black (DKSHADOW)
WH GB
WGGGGGGGGGGGGGGGGGB
BBBBBBBBBBBBBBBBBBB
When the button is selected, the button becomes like this (the total button
size doesn't change):
BBBBBBBBBBBBBBBBBBB
BWWWWWWWWWWWWWWWWBB
BWHHHHHHHHHHHHHHGBB
BWH GBB
BWH GBB
BWGGGGGGGGGGGGGGGBB
BBBBBBBBBBBBBBBBBBB
BBBBBBBBBBBBBBBBBBB
When the button is pushed (while selected) it is like:
BBBBBBBBBBBBBBBBBBB
BGGGGGGGGGGGGGGGGGB
BG GB
BG GB
BG GB
BG GB
BGGGGGGGGGGGGGGGGGB
BBBBBBBBBBBBBBBBBBB
*/
static void DrawButtonFrame(HDC hdc, const RECT& rectBtn,
bool selected, bool pushed)
{
RECT r;
CopyRect(&r, &rectBtn);
HPEN hpenBlack = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DDKSHADOW)),
hpenGrey = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DSHADOW)),
hpenLightGr = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DLIGHT)),
hpenWhite = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DHILIGHT));
HPEN hpenOld = (HPEN)SelectObject(hdc, hpenBlack);
r.right--;
r.bottom--;
if ( pushed )
{
DrawRect(hdc, r);
(void)SelectObject(hdc, hpenGrey);
InflateRect(&r, -1, -1);
DrawRect(hdc, r);
}
else // !pushed
{
if ( selected )
{
DrawRect(hdc, r);
InflateRect(&r, -1, -1);
}
MoveToEx(hdc, r.left, r.bottom, NULL);
LineTo(hdc, r.right, r.bottom);
LineTo(hdc, r.right, r.top - 1);
(void)SelectObject(hdc, hpenWhite);
MoveToEx(hdc, r.left, r.bottom - 1, NULL);
LineTo(hdc, r.left, r.top);
LineTo(hdc, r.right, r.top);
(void)SelectObject(hdc, hpenLightGr);
MoveToEx(hdc, r.left + 1, r.bottom - 2, NULL);
LineTo(hdc, r.left + 1, r.top + 1);
LineTo(hdc, r.right - 1, r.top + 1);
(void)SelectObject(hdc, hpenGrey);
MoveToEx(hdc, r.left + 1, r.bottom - 1, NULL);
LineTo(hdc, r.right - 1, r.bottom - 1);
LineTo(hdc, r.right - 1, r.top);
}
(void)SelectObject(hdc, hpenOld);
DeleteObject(hpenWhite);
DeleteObject(hpenLightGr);
DeleteObject(hpenGrey);
DeleteObject(hpenBlack);
}
bool wxButton::MSWOnDraw(WXDRAWITEMSTRUCT *wxdis)
{
LPDRAWITEMSTRUCT lpDIS = (LPDRAWITEMSTRUCT)wxdis;
RECT rectBtn;
CopyRect(&rectBtn, &lpDIS->rcItem);
COLORREF colBg = wxColourToRGB(GetBackgroundColour()),
colFg = wxColourToRGB(GetForegroundColour());
HDC hdc = lpDIS->hDC;
UINT state = lpDIS->itemState;
// first, draw the background
HBRUSH hbrushBackground = ::CreateSolidBrush(colBg);
FillRect(hdc, &rectBtn, hbrushBackground);
// draw the border for the current state
bool selected = (state & ODS_SELECTED) != 0;
if ( !selected )
{
wxPanel *panel = wxDynamicCast(GetParent(), wxPanel);
if ( panel )
{
selected = panel->GetDefaultItem() == this;
}
}
bool pushed = (SendMessage(GetHwnd(), BM_GETSTATE, 0, 0) & BST_PUSHED) != 0;
DrawButtonFrame(hdc, rectBtn, selected, pushed);
// draw the focus rect if needed
if ( state & ODS_FOCUS )
{
RECT rectFocus;
CopyRect(&rectFocus, &rectBtn);
// I don't know where does this constant come from, but this is how
// Windows draws them
InflateRect(&rectFocus, -4, -4);
DrawFocusRect(hdc, &rectFocus);
}
if ( pushed )
{
// the label is shifted by 1 pixel to create "pushed" effect
OffsetRect(&rectBtn, 1, 1);
}
DrawButtonText(hdc, &rectBtn, GetLabel(),
state & ODS_DISABLED ? GetSysColor(COLOR_GRAYTEXT)
: colFg);
::DeleteObject(hbrushBackground);
return TRUE;
}
#endif // __WIN32__
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