与WT一起使用ACE

Question

UPDATE 3 下面的最终工作代码。您需要src文件夹中的ace.js！从库中无法使用，您需要从其站点下载预包装的版本。

WText *editor = new WText(root());
editor->setText("function(){\n hello.abc();\n}\n");
editor->setInline(false);

上面的代码可以设置ACE窗口的内容。

MyClass::MyClass(const WEnvironment& env)
: WApplication(env)
{
wApp->require("ace-builds/src/ace.js");
// A WContainerWidget is rendered as a div
WContainerWidget *editor = new WContainerWidget(root());
editor->resize(500, 500);

std::string editor_ref = editor->jsRef(); // is a text string that will be the element when executed in JS

std::string command = 
  editor_ref + ".editor = ace.edit(" + editor_ref + ");" +
  editor_ref + ".editor.setTheme(\"ace/theme/monokai\");" +
  editor_ref + ".editor.getSession().setMode(\"ace/mode/javascript\");";

editor->doJavaScript(command);


JSignal <std::string> *jsignal = new JSignal<std::string>(editor, "textChanged");
jsignal->connect(this, &MyClass::textChanged);

WPushButton *b = new WPushButton("Save", root());

command = "function(object, event) {" +
  jsignal->createCall(editor_ref + ".editor.getValue()") +
  ";}";

b->clicked().connect(command);
}

void MyClass::textChanged(std::string incoming)
{

}

更新2 这是我的项目看起来像atm的样子，仍然在右上角显示了白色的屏幕，并带有来自WT的红色“正在加载…”消息。下面有更多注释。

MyClass::MyClass(const WEnvironment& env)
: WApplication(env)
{
wApp->require("lib/ace/ace.js");
// A WContainerWidget is rendered as a div
WContainerWidget *editor = new WContainerWidget(root());
editor->resize(500, 500);

std::string editor_ref = editor->jsRef(); // is a text string that will be the element when executed in JS

std::string command = 
  editor_ref + ".editor = ace.edit(" + editor_ref + ");" +
  editor_ref + ".editor.setTheme(\"ace/theme/monokai\");" +
  editor_ref + ".editor.getSession().setMode(\"ace/mode/javascript\");";

editor->doJavaScript(command);


JSignal <std::string> *jsignal = new JSignal<std::string>(editor, "textChanged");
jsignal->connect(this, &MyClass::textChanged);

WPushButton *b = new WPushButton("Save", root());

command = "function(object, event) {" +
  jsignal->createCall(editor_ref + ".editor.getValue()") +
  ";}";

b->clicked().connect(command);
}

void MyClass::textChanged(std::string incoming)
{

}

当用于编辑器-> doJavaScript（command）时，“ command”变量等于以下变量

"Wt3_3_0.$('oy4ycjy').editor = ace.edit(Wt3_3_0.$('oy4ycjy'));Wt3_3_0.$('oy4ycjy').editor.setTheme('ace/theme/monokai');Wt3_3_0.$('oy4ycjy').editor.getSession().setMode('ace/mode/javascript');"

当它用于b-> clicked（）。connect（command）;时，“ command”变量等于以下变量：

"function(object, event) {Wt.emit('oy4ycjy','textChanged',Wt3_3_0.$('oy4ycjy').editor.getValue());;}"

更新1

向我的构造函数添加了建议的代码，但是页面不会从纯白色屏幕更改。在这个WT项目中，我什么也没做，只运行了这段代码。

wApp->require("lib/ace/ace.js");
// A WContainerWidget is rendered as a div
WContainerWidget *editor = new WContainerWidget(root());
std::string editor_ref = editor->jsRef(); // is a text string that will be the element when executed in JS
editor->doJavaScript(
  editor_ref + ".editor = ace.edit('" + editor_ref + "');" +
  editor_ref + ".editor.setTheme('ace/theme/monokai');" +
  editor_ref + ".editor.getSession().setMode('ace/mode/javascript');"
  );

editor_ref的值是“ Wt3_3_0。$（’oumvrgm’）”减去引号。

还尝试在下面添加代码，但该页面仍然空白。

JSignal <std::string> *jsignal = new JSignal<std::string>(editor, "textChanged");
jsignal->connect(this, &MyClass::textChanged);

WPushButton *b = new WPushButton("Save", root());
b->clicked().connect("function(object, event) {" +
  jsignal->createCall(editor->jsRef() + ".editor.getValue()") +
  ";}");

我也发现将其注释掉

editor_ref + ".editor = ace.edit('" + editor_ref + "');" +

使按钮显示出来，但是屏幕右上方有一个红色的“正在加载…”注释，因此WT正在等待某些操作。

我现在将textChanged作为不执行任何操作的功能。

原始帖子

所以，我的问题是这个。如何在WT
http://www.webtoolkit.eu/wt中获得ACE
http://ace.ajax.org/#nav=about。更具体地说，在WT Wt
:: WTextArea或Wt ::
WTabWidget中的ACE中，首选文本区域。我已经尝试这样做了几天，但并没有取得太大的成功。

我已经能够将ACE嵌入HTML页面中，因为他们的网站说“只需将其复制并粘贴到您的页面中”就可以了，这真的很简单。但是，我需要通过WT将其本地加载到容器中。我将他们的仓库从GIT下载到我的机器上，并尝试使用

require("lib/ace/ace.js");

和

doJavaScript(...);

使用各种命令无法成功…我在Java和HTML方面不如C ++强大，因此如果涉及到很多Java / HTML，我将要求尽可能多的细节。在此先感谢队友！

Answer 1

也许这使您朝着正确的方向前进：

wApp->require("lib/ace/ace.js")
// A WContainerWidget is rendered as a div
WContainerWidget *editor = new WContainerWidget(parent);
// editor->jsRef() is a text string that will be the element when executed in JS
editor->doJavaScript(
    editor->jsRef() + ".editor = ace.edit(" + editor->jsRef() + ");" +
    editor->jsRef() + ".editor.setTheme('ace/theme/monokai');" +
    editor->jsRef() + ".editor.getSession().setMode('ace/mode/javascript');"
  );

那应该装饰编辑器。Wt不会自动将对div的修改发送到服务器，因此您可以通过JSignal手动执行此操作（发出从JS到C ++的信号）：

JSignal <std::string> *jsignal = new JSignal<std::string>(editor, "textChanged");
jsignal->connect(this, MyClass::textChanged);

WPushButton *b = new WPushButton("Save", parent);
b->clicked().connect("function(object, event) {" +
    jsignal->createCall(editor->jsRef() + ".editor.getValue()") +
  ";}");

（上面的代码未经测试，因此您可能需要稍作调整）

我已经将CodeMirror集成在早期的JWt（java）项目中，如下所示：

import eu.webtoolkit.jwt.WApplication;
import eu.webtoolkit.jwt.WContainerWidget;
import eu.webtoolkit.jwt.WTextArea;

public class CodeMirrorTextArea extends WContainerWidget {
        private WTextArea textArea;
        public CodeMirrorTextArea(WContainerWidget parent) {
                super(parent);

                textArea = new WTextArea(this);

                WApplication app = WApplication.getInstance();

                app.require(app.resolveRelativeUrl("codemirror-2.32/lib/codemirror.js"));
                app.require(app.resolveRelativeUrl("codemirror-2.32/mode/groovy/groovy.js"));

                //TODO:
                //We save the editor state to the text area on each key stroke,
                //it appears to be not a performance issue,
                //however it might very well become one when editing larger fragments of code.
                //A better solution would be to save this state to the text area only when
                //the form is submitted, currently this is not yet possible in Wt???.

                String js =
                        "var e = " + textArea.getJsRef() + ";" +
                        "var cm = CodeMirror.fromTextArea(e, {" +
                        "       onKeyEvent : function (editor, event) {" +
                    "           editor.save();" +
                    "   }," +
                        "       lineNumbers: true" +
                        "       });" +
                        "var self = " + getJsRef() + ";" +
                        "self.cm = cm;";

                this.doJavaScript(js);
        }

        public CodeMirrorTextArea() {
                this(null);
        }

        public void setText(String text) {
                textArea.setText(text);
        }

        public String getText() {
                return textArea.getText();
        }

        public void setMarker(int line, String htmlMarker) {
                String js =
                        "var self = " + getJsRef() + ";" +
                        "self.cm.setMarker(" + line + ", " + jsStringLiteral(htmlMarker +
"%N%") + ");";

                this.doJavaScript(js);
        }

        public void clearMarker(int line) {
                String js =
                        "var self = " + getJsRef() + ";" +
                        "self.cm.clearMarker(" + line + ");";

                this.doJavaScript(js);
        }
}