[Author: alcor]

Add fading text field cell

R=dmaclach,thomasvl
DELTA=161  (161 added, 0 deleted, 0 changed)

1 files changed, 69 insertions, 0 deletions

diff --git a/AppKit/GTMFadeTruncatingTextFieldCell.m b/AppKit/GTMFadeTruncatingTextFieldCell.m
new file mode 100644
index 0000000..98eac8c
--- /dev/null
+++ b/AppKit/GTMFadeTruncatingTextFieldCell.m
@@ -0,0 +1,69 @@
+//  GTMFadeTruncatingTextFieldCell.m
+//
+//  Copyright 2009 Google Inc.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License"); you may not
+//  use this file except in compliance with the License.  You may obtain a copy
+//  of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+//  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+//  License for the specific language governing permissions and limitations under
+//  the License.
+//
+
+#import "GTMFadeTruncatingTextFieldCell.h"
+
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
+
+@implementation GTMFadeTruncatingTextFieldCell
+- (void)awakeFromNib {
+  // Force to clipping
+  [self setLineBreakMode:NSLineBreakByClipping];
+}
+
+- (id)initTextCell:(NSString *)aString {
+  self = [super initTextCell:aString];
+  if (self) {
+    // Force to clipping
+    [self setLineBreakMode:NSLineBreakByClipping];
+  }
+  return self;
+}
+
+- (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {
+  CGContextRef context = [[NSGraphicsContext currentContext] graphicsPort];
+  CGContextBeginTransparencyLayer(context, 0);
+
+  [super drawInteriorWithFrame:cellFrame inView:controlView];
+
+  // Don't complicate drawing unless we need to clip
+  NSSize size = [[self attributedStringValue] size];
+  if (size.width > cellFrame.size.width) {
+    // Gradient is about twice our line height long
+    CGFloat width = MIN(size.height * 2, NSWidth(cellFrame) / 4);
+
+    // TODO(alcor): switch this to GTMLinearRGBShading if we ever need on 10.4
+    NSColor *color = [self textColor];
+    NSGradient *mask = [[NSGradient alloc]
+        initWithStartingColor:color
+                  endingColor:[color colorWithAlphaComponent:0.0]];
+
+    // Draw the gradient mask
+    CGContextSetBlendMode(context, kCGBlendModeDestinationIn);
+    [mask drawFromPoint:NSMakePoint(NSMaxX(cellFrame) - width,
+                                    NSMinY(cellFrame))
+                toPoint:NSMakePoint(NSMaxX(cellFrame),
+                                    NSMinY(cellFrame))
+                options:NSGradientDrawsBeforeStartingLocation];
+    [mask release];
+  }
+  CGContextEndTransparencyLayer(context);
+}
+
+@end
+
+#endif