我需要在NSTableView列标题中添加一个复选框。
我已经能够在上述列的所有行中添加复选框。但是我需要在表头级别上添加一个复选框,以实现全选功能。我无法在表头级别上添加一个复选框。如果有示例代码或想法将非常有帮助。
谢谢, Subrat
谢谢, Subrat
NSButtonCell
的子类。@interface CheckboxHeaderCell : NSButtonCell {
NSButtonCell *cellCheckBox;
NSColor *bkColor;
}
-(void)setTitle:(NSString *)title;
-(void)setBkColor:(NSColor *)color;
-(BOOL)getState;
-(void)onClick;
@end
@implementation CheckboxHeaderCell
- (id)init
{
if (self = [super init])
{
bkColor = nil;
cellCheckBox = [[ NSButtonCell alloc] init];
[cellCheckBox setTitle:@""];
[cellCheckBox setButtonType:NSSwitchButton];
[cellCheckBox setBordered:NO];
[cellCheckBox setImagePosition:NSImageRight];
[cellCheckBox setAlignment:NSLeftTextAlignment];
[cellCheckBox setObjectValue:[NSNumber numberWithInt:0]];
[cellCheckBox setControlSize:NSSmallControlSize];
[cellCheckBox setFont:[NSFont systemFontOfSize:[NSFont
smallSystemFontSize]]];
}
return self;
}
- (void)dealloc
{
[cellCheckBox release];
[bkColor release];
[super dealloc];
}
-(void)setTitle:(NSString *)title
{
[cellCheckBox setTitle:title];
}
-(void)setBkColor:(NSColor *)color
{
[color retain];
[bkColor release];
bkColor = color;
}
-(BOOL)getState
{
return [[cellCheckBox objectValue] boolValue];
}
-(void)onClick
{
BOOL state = ![[cellCheckBox objectValue] boolValue];
[cellCheckBox setObjectValue:[NSNumber numberWithBool:state]];
}
- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView
{
if (bkColor != nil)
[cellCheckBox setBackgroundColor:bkColor];
[cellCheckBox drawWithFrame:cellFrame inView:controlView] ;
}
@end
如何使用:
CheckboxHeaderCell *mHeaderCell = [[CheckboxHeaderCell alloc] init];
NSTableColumn *checkBoxColumn = [mOutlineView tableColumnWithIdentifier:@"state"];
[checkBoxColumn setHeaderCell:mHeaderCell];
- (void)tableView: (NSTableView *)tableView didClickTableColumn:(NSTableColumn *)tableColumn
{
NSLog(@"didClickTableColumn");
CheckboxHeaderCell *headerCell = [tableColumn headerCell];
[headerCell onClick];
}
NSCell
实例是行不通的,原因很简单,协调NSHeaderCell
实例的NSTableHeaderView
处理所有鼠标事件处理。因此,表头中的单元格按钮永远不会响应鼠标事件。NSControl
实例添加到自定义的NSTableHeaderView
中。可以在IB中为表视图设置自定义子类。控件是像这样添加到已识别的表列中的:[(BPTableHeaderView *)self.tableView.headerView addSubview:self.passwordTableHeaderButton
columnIdentifier:@"password"
alignment:NSLayoutAttributeRight];
@interface BPTableHeaderView : NSTableHeaderView
- (void)addSubview:(NSView *)view columnIdentifier:(NSString *)identifier alignment:(NSLayoutAttribute)alignment;
@end
@interface BPTableHeaderView()
// collections
@property (strong) NSMutableDictionary<NSString *, NSDictionary *> *store;
// primitives
@property (assign, nonatomic) BOOL subviewsVisible;
@end
@implementation BPTableHeaderView
- (id)initWithFrame:(NSRect)frameRect
{
self = [super initWithFrame:frameRect];
if (self) {
[self commonInit];
}
return self;
}
- (id)initWithCoder:(NSCoder *)coder
{
self = [super initWithCoder:coder];
if (self) {
[self commonInit];
}
return self;
}
- (void)commonInit
{
_subviewsVisible = YES;
_store = [NSMutableDictionary new];
}
#pragma mark -
#pragma mark Accessors
- (void)setSubviewsVisible:(BOOL)subviewsVisible
{
if (_subviewsVisible == subviewsVisible) return;
_subviewsVisible = subviewsVisible;
for (NSString *identifier in self.store.allKeys) {
NSDictionary *info = self.store[identifier];
NSView *view = info[@"view"];
view.hidden = !_subviewsVisible;
}
}
#pragma mark -
#pragma mark Drawing
- (void)drawRect:(NSRect)dirtyRect {
[super drawRect:dirtyRect];
if (self.draggedColumn != -1 || self.resizedColumn != -1) {
[self layoutSubviews];
}
}
#pragma mark -
#pragma mark View management
- (void)addSubview:(NSView *)view columnIdentifier:(NSString *)identifier alignment:(NSLayoutAttribute)alignment
{
self.store[identifier] = @{@"view" : view, @"alignment" : @(alignment)};
[self addSubview:view];
self.needsLayout = YES;
}
#pragma mark -
#pragma mark Layout
- (void)layout
{
[super layout];
[self layoutSubviews];
}
- (void)layoutSubviews
{
for (NSString *identifier in self.store.allKeys)
{
// info
NSDictionary *info = self.store[identifier];
NSView *view = info[@"view"];
NSLayoutAttribute alignment = [info[@"alignment"] integerValue];
// views and cells
NSTableColumn *column = [self.tableView tableColumnWithIdentifier:identifier];
NSTableHeaderCell *headerCell = column.headerCell;
NSInteger idx = [self.tableView.tableColumns indexOfObject:column];
if (idx == NSNotFound) continue;
// rects
NSRect headerRect = [self headerRectOfColumn:idx];
NSRect sortIndicatorRect = NSZeroRect;
if (column.sortDescriptorPrototype) {
sortIndicatorRect = [headerCell sortIndicatorRectForBounds:headerRect];
}
// position view
NSPoint viewOrigin = NSMakePoint(0, 0);
CGFloat y = (headerRect.size.height - view.frame.size.height)/2;
CGFloat xDelta = 3;
if (alignment == NSLayoutAttributeLeft) {
viewOrigin = NSMakePoint(headerRect.origin.x + xDelta, y);
}
else {
viewOrigin = NSMakePoint(headerRect.origin.x + headerRect.size.width - view.frame.size.width - sortIndicatorRect.size.width - 5, y);
}
[view setFrameOrigin:viewOrigin];
}
}
@end