GWT:文本框不会在Ipad上显示光标 [英] GWT: Textbox doesn't show Cursor on Ipad

问题描述

我正在尝试实现一个文本框，该文本框可以显示GWT的分数. 因此，我有一个Canvas，可以绘制我想要的东西并接收KeyEvent和MouseEvent.

I am trying to implement a Textbox that can show fractions with GWT. Therefor I have an Canvas were I can draw what I want and receive KeyEvents and MouseEvents.

但是在Ipad(Safarie和Chrome)上，软件键盘没有显示，因此我创建了一个Composite，将Canvas与Textbox结合起来，在画布上的每个键或鼠标事件发生后便获得了焦点.

But on Ipad (Safarie and Chrome) the software keyboard does not show, so I created an Composite and combined the Canvas with a Textbox witch gets the focus after each key or mouse Event on the Canvas.

但是软键盘不会每次都显示，所以我尝试了一下，可以看到，文本框似乎获得了焦点(它变成了蓝色的边界)，但并不总是显示光标.

But the softkeyboard does not show up every time so I tried a bit and can see, that the Textbox seems to get the focus (it gets a blue boarder) but does not always show the cursor.

这在我的笔记本电脑上不会发生.

This does not happen on my Notebook.

聚焦和显示光标之间有什么区别吗?

Is there any difference between being focused and showing the cursor?

我尝试过:

• 设置光标位置
• 设置文本框的文本.

任何帮助，我们将不胜感激， 克里斯多夫(Christoph)

Any help would be appreciated, Christoph

    public void setFocus(boolean b) {
    //  if (hasFocus) {
        Scheduler.get().scheduleDeferred(new ScheduledCommand() {
            public void execute () {
                t.setFocus(b);
            }
           });
        Scheduler.get().scheduleDeferred(new ScheduledCommand() {
            public void execute () {
                box.setFocus(true);
                box.setText("x");
                box.setCursorPos(0);
//              box.setVisible(false);
//              box.setVisible(true);
            }
           });

  //        t.setFocus(b);
//      box.setFocus(b);

//      }
    }

推荐答案

iOS浏览器不允许以编程方式设置焦点，除非直接响应用户交互(即触摸).我相信原因是为了防止网站无缘无故地打开虚拟键盘.

The iOS browsers don't allow the focus to be set programmatically unless directly in response to a user interaction (i.e. a touch). I believe the reason is to prevent websites bringing up the virtual keyboard for no reason.

不利之处在于，它会为出于正当理由使用它的网站掩盖setFocus().您不能在延迟命令中调用setFocus()，因为这不算作对用户交互的直接响应.

The downside is that it clobbers setFocus() for websites that want to use it for legitimate reasons. You can't call setFocus() in a deferred command because that doesn't count as a direct response to the user interaction.

(更确切地说，您可以 用延期命令调用setFocus()，但是您发现的效果不理想.)

(To be more precise, you can call setFocus() in a deferred command, but it won't have the desired effect as you found out.)

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