106 lines
3.2 KiB
Objective-C
106 lines
3.2 KiB
Objective-C
// 17 may 2014
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#include "objc_darwin.h"
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#import <AppKit/NSPopUpButton.h>
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#import <AppKit/NSComboBox.h>
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#import <AppKit/NSArrayController.h>
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/*
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Cocoa doesn't have combo boxes in the sense that other systems do. NSPopUpButton is not editable and technically behaves like a menu on a menubar. NSComboBox is editable and is the more traditional combo box, but the edit field and list are even more separated than they are on other platforms.
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Unfortunately, their default internal storage mechanisms exhibit the automatic selection behavior I DON'T want, so we're going to have to do that ourselves.
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The NSArrayController we use in our Listboxes already behaves the way we want. Consequently, you'll notice a bunch of functions here call functions in listbox_darwin.m. How convenient =P (TODO separate into objc_darwin.m?)
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TODO should we use NSComboBox's dataSource feature?
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*/
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extern NSRect dummyRect;
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#define to(T, x) ((T *) (x))
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#define toNSPopUpButton(x) to(NSPopUpButton, (x))
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#define toNSComboBox(x) to(NSComboBox, (x))
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#define toNSInteger(x) ((NSInteger) (x))
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#define fromNSInteger(x) ((intptr_t) (x))
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#define COMBOBOXKEY @"cbitem"
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static NSString *comboboxKey = COMBOBOXKEY;
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static NSString *comboboxBinding = @"contentValues";
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static NSString *comboboxKeyPath = @"arrangedObjects." COMBOBOXKEY;
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id makeCombobox(BOOL editable)
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{
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NSArrayController *ac;
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ac = makeListboxArray();
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#define BIND bind:comboboxBinding toObject:ac withKeyPath:comboboxKeyPath options:nil
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// for NSPopUpButton, we need a little extra work to make it respect the NSArrayController's selection behavior properties
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// thanks to stevesliva (http://stackoverflow.com/questions/23715275/cocoa-how-do-i-suppress-nspopupbutton-automatic-selection-synchronization-nsar)
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// note: selectionIndex isn't listed in the Cocoa Bindings Reference for NSArrayController under exposed bindings, but is in the Cocoa Bindings Programming Topics under key-value observant properties, so we can still bind to it
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#define BINDSEL bind:@"selectedIndex" toObject:ac withKeyPath:@"selectionIndex" options:nil
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if (!editable) {
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NSPopUpButton *pb;
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pb = [[NSPopUpButton alloc]
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initWithFrame:dummyRect
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pullsDown:NO];
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[pb BIND];
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[pb BINDSEL];
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return pb;
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}
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NSComboBox *cb;
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cb = [[NSComboBox alloc]
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initWithFrame:dummyRect];
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[cb setUsesDataSource:NO];
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[cb BIND];
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// no need to bind selection
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return cb;
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}
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id comboboxText(id c, BOOL editable)
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{
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if (!editable)
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return [toNSPopUpButton(c) titleOfSelectedItem];
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return [toNSComboBox(c) stringValue];
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}
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void comboboxAppend(id c, BOOL editable, id str)
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{
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id ac;
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ac = boundListboxArray(c, comboboxBinding);
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listboxArrayAppend(ac, toListboxItem(comboboxKey, str));
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}
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void comboboxInsertBefore(id c, BOOL editable, id str, intptr_t before)
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{
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id ac;
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ac = boundListboxArray(c, comboboxBinding);
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listboxArrayInsertBefore(ac, toListboxItem(comboboxKey, str), before);
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}
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intptr_t comboboxSelectedIndex(id c)
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{
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// both satisfy the selector
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return fromNSInteger([toNSPopUpButton(c) indexOfSelectedItem]);
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}
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void comboboxDelete(id c, intptr_t index)
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{
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id ac;
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ac = boundListboxArray(c, comboboxBinding);
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listboxArrayDelete(ac, index);
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}
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intptr_t comboboxLen(id c)
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{
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// both satisfy the selector
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return fromNSInteger([toNSPopUpButton(c) numberOfItems]);
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}
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