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自动滚动问题

发布于 2024-10-17 03:57:37 字数 1045 浏览 3 评论 0原文

1.创建一个cocoa应用程序（不是基于文档的）

2.创建一个新类“StretchView”（NSView的子类）

3.打开界面构建器并将“滚动视图”拖到主窗口

4.选择“滚动视图”并设置类“StretchView”（在类标识窗口中）

contentview 的大小为 500*500，strechview 的大小也是 500*500 （水平滚动已启用）。

然后我开始一个接一个地水平画一些数字（1,2,3,4……）。当数字超出范围时（x pos 大于 500）我增加宽度 StretchView 的。（到目前为止一切正常）

然后我尝试让水平滚动条自动滚动到最后，这样每次我增加 StretchView 的宽度时，最后一个数字可能是看到了。

这是代码：

//The timer is called every sec
-(void)myTimerAction:(NSTimer *) timer
{  
    NSLog(@"myTimerAction");

       //......
    int i = _myArray.count;
    NSRect rect = [self frame];
    int width = rect.size.width;

       //The width between two number is 10
       //When the x pos of current num is bigger then the scroll's width
    if((i * 10) > width) {

           //reset the width
        width = i * 10;
        [self setFrameSize:CGSizeMake(width, rect.size.height)];
           //How to make it autoscroll???
           //...............................
    }
    //......
    [self setNeedsDisplay:YES];
}

原文

1.Create a cocoa application (not document-based)

2.Create a new class "StretchView"(subclass NSView)

3.Open the Interface builder and drag a "Scroll view" to the main window

4.Choose the "Scroll view" and set the class "StretchView" (in class identity window)

The size of the contentview is 500*500 and the size of the strechview is also 500*500
(horizontal Scroll is enabled).

Then I start to draw some numbers(1,2,3,4......) horizontally one after the other.
When the number is out of ranger(the x pos is larger than 500) I increase the width
of the StretchView. (Everything works fine up till this point)

Then I tried to make the horizontal scroller to automatically scroll to the end so
that everytime I increase the width of the StretchView the last number coulde be
seen.

Here's the code:

//The timer is called every sec
-(void)myTimerAction:(NSTimer *) timer
{  
    NSLog(@"myTimerAction");

       //......
    int i = _myArray.count;
    NSRect rect = [self frame];
    int width = rect.size.width;

       //The width between two number is 10
       //When the x pos of current num is bigger then the scroll's width
    if((i * 10) > width) {

           //reset the width
        width = i * 10;
        [self setFrameSize:CGSizeMake(width, rect.size.height)];
           //How to make it autoscroll???
           //...............................
    }
    //......
    [self setNeedsDisplay:YES];
}

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心房的律动 2024-10-24 03:57:37

试试这个：

NSView *contentView = [[self enclosingScrollView] contentView];
CGFloat newXPosition = width - NSWidth([contentView bounds]);
if (newXPosition > 0.0) [self scrollPoint:NSMakePoint(newXPosition, 0.0)];

contentView 是封闭滚动视图中的剪切视图。您希望将当前视图滚动到视图中的 x 点，以便该 x 点 + 剪切视图宽度给出视图的最后一个剪切视图宽度点。

Try this:

NSView *contentView = [[self enclosingScrollView] contentView];
CGFloat newXPosition = width - NSWidth([contentView bounds]);
if (newXPosition > 0.0) [self scrollPoint:NSMakePoint(newXPosition, 0.0)];

contentView is the clipping view in the enclosing scroll view. You want to scroll your current view to the x point in your view such that this x point + the clipping view width give the last clipping view width points of your view.

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