Question

我想进行绑定，当按下buttonA时（将值从false更改为true）lightIsTurnedOn转动true（buttonB的值的独立值），当另一个{{1}时按下（将值从false更改为true）buttonB变为lightIsTurnedOn（buttonA的值的独立值）。是否可以使用绑定来处理它？

false

Answer 1

ToggleButtons似乎是一个完美的任务：

ToggleButton buttonA = new ToggleButton("A");
ToggleButton buttonB = new ToggleButton("B");

Label label = new Label();
label.textProperty().bind(buttonA.selectedProperty().or(buttonB.selectedProperty()).asString());

Label的文字将在"true"中至少有一个“开启”时更改为ToggleButton，如果两个"false"都更改为<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:HiddenField ID="currTab" runat="server" /> <asp:Panel ID="tabPanel" runat="server"> <ul> <li><a href="#Panel1" style="padding-left:8px;"><span>General Feedback</span></a></li> <li><a href="#Panel2" style="padding-left:6px;"><span>New Requirements</span></a></li> <li><a href="#Panel3" style="padding-left:8px;"><span>My Feedback</span></a></li> </ul> <%-- general feedback tab--%> <asp:Panel ID="Panel1" runat="server"> <div class="tabcaption">General Feedback</div> <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"></asp:ToolkitScriptManager> <table class="general"> <tr> <td style="padding-left:22px;">1.Did you find the information you were looking for?</td> </tr> <tr> <td style="padding-left:30px;"> if no please explain why?</td> </tr> <tr > <td style="padding-left:28px;"> <div id="RadioDiv1"> <asp:RadioButtonList ID="radiolist1" runat="server" RepeatDirection="Horizontal" RepeatLayout="Flow" CssClass="radio1"> <asp:ListItem Value="yes">Yes   </asp:ListItem> <asp:ListItem Value="no">No</asp:ListItem> </asp:RadioButtonList> </div> </td> </tr> <tr > <td > <div id="info" style="padding-left:64px;">Please Explain: <asp:TextBox ID="infodesc" runat="server" CssClass="textb" TextMode="MultiLine"></asp:TextBox> </div> </td> </tr> <tr> <td style="padding-left:22px;"> 2.Did the portal meet your need/ answer your questions?</td> </tr> <tr> <td style="padding-left:30px;"> if no please explain why?</td> </tr> <tr > <td style="padding-left:28px;"> <div id="RadioDiv2"> <asp:RadioButtonList ID="RadioButtonList1" runat="server" RepeatDirection="Horizontal" RepeatLayout="Flow" CssClass="radio1"> <asp:ListItem Value="yes">Yes   </asp:ListItem> <asp:ListItem Value="no">No</asp:ListItem> </asp:RadioButtonList> </div> </td> </tr> <tr > <td > <div id="port" style="padding-left:64px;">Please Explain: <asp:TextBox ID="portdesc" runat="server" CssClass="textb" TextMode="MultiLine"></asp:TextBox> </div> </td> </tr> <tr><td style="padding-left:22px;">3.Please rate these</td> </tr> <tr> <td style="padding-left:32px;">a.GUI</td> <td> <asp:Rating ID="Rating1" runat="server" BehaviorID="RatingBehavior1" CssClass="textb" MaxRating="5" StarCssClass="ratingStar" WaitingStarCssClass="savedRatingStar1" FilledStarCssClass="filledRatingStar1" EmptyStarCssClass="emptyRatingStar1" OnChanged="ThaiRating_Changed" Style="float: left;" /> </td> </tr> <tr> <td style="padding-left:32px;">b.Correctness of content</td> <td> <asp:Rating ID="Rating2" runat="server" BehaviorID="RatingBehavior2" CssClass="textb" MaxRating="5" StarCssClass="ratingStar" WaitingStarCssClass="savedRatingStar1" FilledStarCssClass="filledRatingStar1" EmptyStarCssClass="emptyRatingStar1" OnChanged="ThaiRating_Changed" Style="float: left;" /> </td> </tr> <tr> <td style="padding-left:32px;">c.Existing functionality</td> <td> <asp:Rating ID="Rating3" runat="server" BehaviorID="RatingBehavior3" CssClass="textb" MaxRating="5" StarCssClass="ratingStar" WaitingStarCssClass="savedRatingStar1" FilledStarCssClass="filledRatingStar1" EmptyStarCssClass="emptyRatingStar1" OnChanged="ThaiRating_Changed" Style="float: left;" /> </td> </tr> <tr><td style="padding-left:22px;">4.Please give a feedback</td></tr> <tr> <td style="padding-left:34px;"> <asp:TextBox ID="msg" runat="server" CssClass="textb" TextMode="MultiLine"></asp:TextBox> </td> </tr> <tr> <td style="padding-left:22px;">5.Do you have any document/image/screenshot/slide for the new requirement reference? if yes,please upload(max 2MB)</td> </tr> <tr> <td> <asp:FileUpload ID="fileupload1" runat="server" CssClass="textb" onchange="validateFileSize();"/> <asp:Label ID="lblMessage" Text=" " runat="server" style="color:Red;"/> <div id="dvMsg" style="color:Red; width:195px;display:none;" > File size is greater than 2mb </div> </td> </tr> </table> <asp:Button ID="Button1" runat="server" OnClick="btnUpload_Click" Text="Save and Continue" CssClass="btn" AutoPostback = "false"/> <%-- <asp:Button ID="Button4" runat="server" Text="Save and Continue" CssClass="btn" OnClick="Button4_Click" />--%> </asp:Panel> <%-- new requirements tab--%> <asp:Panel ID="Panel2" runat="server"> <div class="tabcaption">New requirements</div> <table class="newrq"> <tr> <td style="padding-left:22px;"> 1.What are your new Requirements? 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Answer 2

不能用绑定做到这一点。绑定的值由computeValue方法计算（至少不在某处存储其他信息）。此方法不会获取任何参数。它根本没有关于哪个依赖项最后失效的任何信息。

因此，无法区分以下修改序列

buttonA pressed
buttonB pressed

和

buttonB pressed
buttonA pressed

但结果是lightIsTurnedOn为false / true。

然而，当然这样的事情是可能的，即使只是向设置值的属性添加监听器也是可取的。

@Override
public void start(Stage primaryStage) {
    ToggleButton buttonA = new ToggleButton("A");
    ToggleButton buttonB = new ToggleButton("B");
    Circle light = new Circle(30, Color.YELLOW);
    light.visibleProperty().bind(new BooleanBinding() {


        boolean lastA = false;
        boolean lastB = false;

        {
            bind(buttonA.selectedProperty(), buttonB.selectedProperty());
        }

        boolean value = false;

        @Override
        protected boolean computeValue() {
            boolean a = buttonA.isSelected();
            boolean b = buttonB.isSelected();
            if (lastA != a && a) {
                value = true;
            }

            if (lastB != b && b) {
                value = false;
            }
            lastA = a;
            lastB = b;
            return value;
        }
    });

    HBox root = new HBox(buttonA, buttonB, light);
    root.setAlignment(Pos.CENTER);

    Scene scene = new Scene(root);

    primaryStage.setScene(scene);
    primaryStage.show();
}

使用多个输入创建绑定

2 个答案: