libui/windows/combobox.c

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// 20 may 2015
#include "uipriv_windows.h"
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// we as Common Controls 6 users don't need to worry about the height of comboboxes; see http://blogs.msdn.com/b/oldnewthing/archive/2006/03/10/548537.aspx
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struct uiCombobox {
uiWindowsControl c;
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HWND hwnd;
void (*onSelected)(uiCombobox *, void *);
void *onSelectedData;
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};
uiWindowsDefineControlWithOnDestroy(
uiCombobox, // type name
uiComboboxType, // type function
uiWindowsUnregisterWM_COMMANDHandler(this->hwnd); // on destroy
)
// note: NOT triggered on entering text
static BOOL onWM_COMMAND(uiControl *cc, HWND hwnd, WORD code, LRESULT *lResult)
{
uiCombobox *c = uiCombobox(cc);
if (code != CBN_SELCHANGE)
return FALSE;
(*(c->onSelected))(c, c->onSelectedData);
*lResult = 0;
return TRUE;
}
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// from http://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
#define comboboxWidth 107 /* this is actually the shorter progress bar width, but Microsoft only indicates as wide as necessary */
#define comboboxHeight 14
static void minimumSize(uiWindowsControl *c, uiWindowsSizing *d, intmax_t *width, intmax_t *height)
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{
*width = uiWindowsDlgUnitsToX(comboboxWidth, d->BaseX);
*height = uiWindowsDlgUnitsToY(comboboxHeight, d->BaseY);
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}
static void defaultOnSelected(uiCombobox *c, void *data)
{
// do nothing
}
void uiComboboxAppend(uiCombobox *c, const char *text)
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{
WCHAR *wtext;
LRESULT res;
wtext = toUTF16(text);
res = SendMessageW(c->hwnd, CB_ADDSTRING, 0, (LPARAM) wtext);
if (res == (LRESULT) CB_ERR)
logLastError("error appending item to uiCombobox");
else if (res == (LRESULT) CB_ERRSPACE)
logLastError("memory exhausted appending item to uiCombobox");
uiFree(wtext);
}
intmax_t uiComboboxSelected(uiCombobox *c)
{
LRESULT n;
n = SendMessage(c->hwnd, CB_GETCURSEL, 0, 0);
if (n == (LRESULT) CB_ERR)
return -1;
return (intmax_t) n;
}
void uiComboboxOnSelected(uiCombobox *c, void (*f)(uiCombobox *c, void *data), void *data)
{
c->onSelected = f;
c->onSelectedData = data;
}
static uiCombobox *finishNewCombobox(DWORD style)
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{
uiCombobox *c;
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c = (uiCombobox *) uiNewControl(uiComboboxType());
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c->hwnd = uiWindowsEnsureCreateControlHWND(WS_EX_CLIENTEDGE,
L"combobox", L"",
style | WS_TABSTOP,
hInstance, NULL,
TRUE);
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uiWindowsRegisterWM_COMMANDHandler(c->hwnd, onWM_COMMAND, uiControl(c));
uiComboboxOnSelected(c, defaultOnSelected, NULL);
uiWindowsFinishNewControl(c, uiCombobox);
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return c;
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}
uiCombobox *uiNewCombobox(void)
{
return finishNewCombobox(CBS_DROPDOWNLIST);
}
uiCombobox *uiNewEditableCombobox(void)
{
return finishNewCombobox(CBS_DROPDOWN);
}