components - The qml default signal handler cannot work -

-

---question---

i create "textbtn" component , add signal "btnclicked" in it:

textbtn.qml

import qt 4.7  rectangle {     property alias btntext: showstr.text     width:100     height:30     border.color: "black"     border.width: 1     color: "white"     signal btnclicked()     //the default signal handler     onbtnclicked: console.log(btntext+" clicked.")     mousearea {         id: btnmousearea         anchors.fill: parent         onclicked: btnclicked()     }     text {         id: showstr         anchors.centerin: parent         color: "black"     } }

another component "menurow" contains 3 "textbtn"s follows:

menurow.qml

import qt 4.7  row {     spacing: 5     textbtn {         id: testbtn01         btntext: "test01"     }     textbtn {         id: testbtn02         btntext: "test02"     }     textbtn {         id: testbtn03         btntext: "test03"     } }

the default single handler "onbtnclicked" in "textbtn" should triggered when 1 of "textbtn"s in "menurow" clicked, doesn't. what's going on?

the related qml doc here: http://doc.qt.nokia.com/4.7/gettingstartedqml.html#basic-component-a-button

---development environment---

os: ubuntu 10.04

qt version: 4.7.0(use "qt-sdk-linux-x86-opensource-2010.05.1.bin" install qt sdk in default path "$home/qtsdk-2010.05/")

before running qml, source file "qtsetup.sh" set related paths,

$ source qtsetup.sh

qtsetup.sh

qtdir=$home/qtsdk-2010.05/qt/ path=$path:$qtdir/bin ld_library_path=$ld_library_path:$qtdir/lib

then run qml files "qmlviewer".

$ qmlviewer menurow.qml

a qmlviewer window triggered , shows "menurow". no error occurs. use mouse click "textbtn" in "menurow", nothing happens. (it should show message "text0x clicked" in terminal.)

i use qmlviewer run other examples , demos, seem work well. don't know why example cannot work.

the problem happens here (qmlviewer 4.7.0).

looks it's bug in qmlviewer, read follow-ups here.

if remove alias (btntext), signal work. (but proper solution update 4.7.1+)


Comments

Post a Comment

Popular posts from this blog

python - Scipy curvefit RuntimeError:Optimal parameters not found: Number of calls to function has reached maxfev = 1000 -

-
Image
i want make logharitmic fit. keep getting runtime error: optimal parameters not found: number of calls function has reached maxfev = 1000 i use following script. can tell me go wrong? use spyder still beginner. import math import matplotlib mpl scipy.optimize import curve_fit import numpy np #data f1=[735.0,696.0,690.0,683.0,680.0,678.0,679.0,675.0,671.0,669.0,668.0,664.0,664.0] t1=[1,90000.0,178200.0,421200.0,505800.0,592200.0,768600.0,1036800.0,1371600.0,1630800.0,1715400.0,2345400.0,2409012.0] f1n=np.array(f1) t1n=np.array(t1) plt.plot(t1,f1,'ro',label="original data") # curvefit def func(t,a,b): return a+b*np.log(t) t=np.linspace(0,3600*24*28,13) popt, pcov = curve_fit(func, t, f1n, maxfev=1000) plt.plot(t, func(t, *popt), label="fitted curve") plt.legend(loc='upper left') plt.show() your original data t1 , f1 . therefore curve_fit should given t1 second argument, not t . popt, pcov = curve_fit(func,
Read more

c# - How to add a new treeview at the selected node? -

-
i have treeview 4 levels; parent, child, grandchild, great-grandchild. selectednode @ grandchild level. what i'm trying create new "treeview" @ grandchild - no, dont wnat create new node "selectednode" (grandchild). should somelike this: parent child grandchild (new treeview) parent grandchild great-grandchild child great-grandchild child grandchild grandchild it similar parent table mother , father went off , had new childern different spouse other spouse of there existing children. private sub populaterootlevel() ' query find first round of parent populatenodes(dt, jcatreeview.nodes) end sub private sub populatenodes(byval dt datatable, byval nodes treenodecollection) each dr datarow in dt.rows dim tn new treenode() tn.text = dr("title").tostring()
Read more

java - netbeans "Please wait - classpath scanning in progress..." -

-
when try compile netbeans projects message/error : "please wait - classpath scanning in progress..." and nothing happens , have have wait enternity conmpile "hello world"... now first thing have moved new office building, laptop same. it's secure enviroment lot of "security", can't connect anywhere almost. have changed user dir in netbeans.conf save data in c:\program files\user any ideas how fix this? alrady tried reinstalling netbeans, changing save location between standart , newone... just ideas find problem look @ cpu - netbeans busy (100% on 1 core) or blocking (95% idle)? standard, ant or maven build? libraries , use absolute or relative paths? start simple "hello world" project (no dependencies), add 1 lib (log4j or similiar), located in project folder , - if works - move lib other locations (choose locations similiar libs on real classpath) there chance, don't have access rights folders/shares conta
Read more