Wt布局令人头疼
Wt layout headache
我正在评估Wt，直到遇到布局问题，我的代码似乎与浏览器中的内容不一致，这给我留下了深刻的印象。主要是因为容器（显然）不应该重叠。这里有一个例子来说明我的意思：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <string>
using namespace std;
#include <Wt/WApplication>
#include <Wt/WContainerWidget>
#include <Wt/WLineEdit>
#include <Wt/WHBoxLayout>
#include <Wt/WVBoxLayout>
#include <Wt/WGroupBox>
#include <Wt/WLabel>
#include <Wt/WDateEdit>
#include <Wt/WStackedWidget>
#include <Wt/WMenu>
#include <Wt/WBootstrapTheme>
#include <Wt/WTabWidget>
using namespace Wt;
class TSTApplication : public WApplication
{
WContainerWidget *body;
public:
TSTApplication(const WEnvironment& env);
};
class TSTConcoction : public WContainerWidget
{
public:
TSTConcoction();
};
TSTConcoction::TSTConcoction()
{
WVBoxLayout *vbox = new WVBoxLayout;
WGroupBox *gbox = new WGroupBox("A Group Box");
WTabWidget *tabw = new WTabWidget(gbox);
tabw->setStyleClass("tabwidget");
// tab1:
{
WContainerWidget *tab = new WContainerWidget;
WHBoxLayout *hbox = new WHBoxLayout;
hbox->addWidget(new WLabel("First:"));
hbox->addWidget(new WLineEdit);
hbox->addWidget(new WLabel("Second:"));
hbox->addWidget(new WLineEdit);
hbox->addWidget(new WLabel("Third:"));
hbox->addWidget(new WLineEdit);
tab->setLayout(hbox);
tabw->addTab(tab, "TAB1", Wt::WTabWidget::PreLoading);
}
// tab2:
{
WContainerWidget *tab = new WContainerWidget;
WHBoxLayout *hbox = new WHBoxLayout;
hbox->addWidget(new WLabel("Only:"));
hbox->addWidget(new WLineEdit);
tab->setLayout(hbox);
tabw->addTab(tab, "TAB2", Wt::WTabWidget::PreLoading);
}
vbox->addWidget(gbox);
// towards the bottom
gbox = new WGroupBox("Below The Lot");
WHBoxLayout *hbox = new WHBoxLayout;
hbox->addWidget(new WLabel("Left:"));
hbox->addWidget(new WDateEdit);
hbox->addWidget(new WLineEdit);
hbox->addWidget(new WLabel("Middle:"));
hbox->addWidget(new WDateEdit);
hbox->addWidget(new WLineEdit);
hbox->addWidget(new WLabel("Right:"));
hbox->addWidget(new WLineEdit);
gbox->setLayout(hbox);
vbox->addWidget(gbox);
setLayout(vbox);
}
TSTApplication::TSTApplication
(
const WEnvironment& env
)
: WApplication(env)
{
WApplication::instance()->setTheme(new WBootstrapTheme);
WContainerWidget *appcont = new WContainerWidget;
WStackedWidget *contents = new WStackedWidget;
WMenu *menu = new WMenu(contents, Wt::Horizontal, appcont);
menu->addStyleClass("nav-tabs");
// tab1
WContainerWidget *cont = new WContainerWidget;
WVBoxLayout *vbox = new WVBoxLayout;
WHBoxLayout *hbox = new WHBoxLayout;
WLabel *l = new WLabel("Dummy:");
hbox->addWidget(l);
hbox->addWidget(new WLineEdit);
vbox->addLayout(hbox);
vbox->addWidget(new TSTConcoction);
cont->setLayout(vbox);
menu->addItem("TAB1", cont);
// tab2
cont = new WContainerWidget;
vbox = new WVBoxLayout;
vbox->addWidget(new WLabel("TODO"));
cont->setLayout(vbox);
menu->addItem("TAB2", cont);
appcont->addWidget(contents);
root()->addWidget(appcont);
}
WApplication *createApplication(const WEnvironment& env)
{
return new TSTApplication(env);
}
int main(int argc, char **argv)
{
return WRun(argc, argv, &createApplication);
}
这里是另一个（看似无关）的例子：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <string>
using namespace std;
#include <Wt/WApplication>
#include <Wt/WBreak>
#include <Wt/WContainerWidget>
#include <Wt/WPushButton>
#include <Wt/WText>
#include <Wt/WVBoxLayout>
#include <Wt/WLabel>
#include <Wt/WStackedWidget>
#include <Wt/WMenu>
#include <Wt/WBootstrapTheme>
using namespace Wt;
class TSTApplication : public WApplication
{
WContainerWidget *body;
void start();
public:
TSTApplication(const WEnvironment& env);
};
class TSTMessage : public WContainerWidget
{
public:
TSTMessage();
};
class TSTRelatives : public WContainerWidget
{
void expand();
public:
TSTRelatives(const string &);
};
class TSTChildren : public TSTRelatives
{
public:
TSTChildren();
};
class TSTParent : public TSTRelatives
{
public:
TSTParent();
};
const char *MESSAGE = "This is a messagen
to help illustrate the problem i amn
having with the relative offsets ofn
container widgets";
const char *BODY = " A Proferred Official ICPn
n
By Initial Connection Protocol (ICP), I mean a third level protocoln
which is initiated by a user process at one site in order to contact an
server process at another site. Typically, the user process will be an
Telnet and the server process will be a logger, but there may be othern
cases.n
n
In this RFC, I wish to describe a family of ICPs suitable forn
establishing one pair of connections (one in each direction) between anyn
user process and any server process, and to propose further a particularn
subset of this family as the standard ICP for connecting user processesn
to loggers on systems which accept teletype-like devices.";
TSTMessage::TSTMessage()
{
WVBoxLayout *vbox = new WVBoxLayout;
vbox->addWidget(new WText("<pre>" + string(MESSAGE) + "</pre>"));
vbox->addWidget(new TSTParent);
vbox->addWidget(new TSTChildren);
vbox->addWidget(new WText("<pre>" + string(BODY) + "</pre>"));
vbox->addWidget(new WPushButton("Dummy Button"));
setLayout(vbox);
}
TSTRelatives::TSTRelatives
(
const string &who
)
{
setLayoutSizeAware(true);
WVBoxLayout *vbox = new WVBoxLayout;
WPushButton *expand = new WPushButton("Expand " + who);
expand->clicked().connect(this, &TSTRelatives::expand);
vbox->addWidget(expand);
setLayout(vbox);
}
void TSTRelatives::expand()
{
clear();
for (int i = 0; i < 2; i++)
{
this->addWidget(new WBreak);
WString num = WString("{1}<hr/>").arg(i);
this->addWidget(new WText(num));
this->addWidget(new TSTMessage);
}
}
TSTChildren::TSTChildren()
: TSTRelatives("Children")
{
setStyleClass("children");
}
TSTParent::TSTParent()
: TSTRelatives("Parent")
{
setStyleClass("parent");
}
void TSTApplication::start()
{
for (int i = 0; i < 3; i++)
{
body->addWidget(new WBreak);
WString num = WString("{1}<hr/>").arg(i);
body->addWidget(new WText(num));
body->addWidget(new TSTMessage);
}
}
TSTApplication::TSTApplication
(
const WEnvironment& env
)
: WApplication(env)
{
WApplication::instance()->useStyleSheet("tstui.css");
WApplication::instance()->setTheme(new WBootstrapTheme);
WContainerWidget *appcont = new WContainerWidget;
WStackedWidget *contents = new WStackedWidget;
WMenu *menu = new WMenu(contents, Wt::Horizontal, appcont);
menu->addStyleClass("nav-tabs");
// tab1
WContainerWidget *cont = new WContainerWidget;
WVBoxLayout *vbox = new WVBoxLayout;
body = new WContainerWidget;
WPushButton *b = new WPushButton("Start");
b->clicked().connect(this, &TSTApplication::start);
vbox->addWidget(b);
vbox->addWidget(body);
cont->setLayout(vbox);
menu->addItem("TAB1", cont);
// tab2
cont = new WContainerWidget;
vbox = new WVBoxLayout;
vbox->addWidget(new WLabel("TODO"));
cont->setLayout(vbox);
menu->addItem("TAB2", cont);
appcont->addWidget(contents);
root()->addWidget(appcont);
}
WApplication *createApplication(const WEnvironment& env)
{
return new TSTApplication(env);
}
int main(int argc, char **argv)
{
return WRun(argc, argv, &createApplication);
}
加载时，在页面周围任意点击展开父级/子级按钮，在几次迭代中，一些不需要的容器重叠悄悄出现。
要使它们运行，请将每个示例放入一个文件（例如tst.cpp）中，并使用（在linux上）进行编译：
c++-o tst tst.cpp-lwthttp-lwt
并运行：
/tst—docroot--http地址0.0.0.0--http端口8080
通常在这一点上，人们可能会想继续评估下一个框架，但我知道C++和Qt，所以Wt非常适合，我希望我能找到一个简单的解释来继续我的Wt之旅。
没有人会反对任何帮助。
被Wt团队确认为布局管理器中的一个错误。http://redmine.webtoolkit.eu/issues/2488
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