author | ca |
Mon, 16 Jun 1997 18:58:43 +0200 | |
changeset 602 | b1ac53a44327 |
parent 596 | a184f2e4dbbb |
child 632 | 844b1aaf3eeb |
permissions | -rw-r--r-- |
59 | 1 |
" |
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COPYRIGHT (c) 1995 by Claus Gittinger |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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EventListener subclass:#ActiveHelp |
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216 | 15 |
instanceVariableNames:'currentView currentHelpView currentFrame showProcess closeProcess' |
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classVariableNames:'DelayTime ShowTime TheOneAndOnlyHelpListener' |
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poolDictionaries:'' |
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category:'Interface-Help' |
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59 | 19 |
! |
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338
071f92621e3b
oops - catching the terminateSignal is no good idea
Claus Gittinger <cg@exept.de>
parents:
330
diff
changeset
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!ActiveHelp class methodsFor:'documentation'! |
59 | 22 |
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138 | 23 |
copyright |
24 |
" |
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COPYRIGHT (c) 1995 by Claus Gittinger |
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All Rights Reserved |
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28 |
This software is furnished under a license and may be used |
|
29 |
only in accordance with the terms of that license and with the |
|
30 |
inclusion of the above copyright notice. This software may not |
|
31 |
be provided or otherwise made available to, or used by, any |
|
32 |
other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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||
59 | 36 |
! |
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documentation |
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" |
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98 | 40 |
The active help listener. |
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The one and only instance of myself intercepts incoming mouse & keyboard |
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events for the display device, being especially interested in view-enter/ |
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100 | 43 |
leave enents. When such an event arrives, it asks the corresponding view |
98 | 44 |
or its model for a help message and display it via an ActiveHelpView. |
100 | 45 |
This query is repeated along the views superView chain, until any model or |
46 |
view returns a nonNil answer for the #helpTextFor:at or #helpTextFor |
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message. |
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48 |
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98 | 49 |
All I need for automatic help is some model/view/applicationModel along |
50 |
the superview chain of the entered component, which responds to the |
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#helpTextFor: message with a non-nil (string-) answer. |
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I close down the help view after a while, if a key is pressed or the mouse |
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moved to another view. |
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100 | 54 |
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Who should provide the helpText: |
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221 | 57 |
the best place is the application object (an instance of ApplicationModel) |
58 |
or the topView, if its a derived class of StandardSystemView. |
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This should know about its components and return the string |
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60 |
when asked via #helpTextFor:aComponent. |
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330
d7ce98930ad3
Rename Launcher-->OldLauncher, NewLauncher-->Launcher.
Stefan Vogel <sv@exept.de>
parents:
297
diff
changeset
|
61 |
See examples in FileBrowser, Launcher etc. |
100 | 62 |
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63 |
Be aware, that for applicationModels, there must be a link from the |
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topView to this applicationModel |
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(set via: aTopView application:anApplicationModel) |
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otherwise, the helpManager has no means of finding the application which |
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corresponds to a view. |
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68 |
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69 |
Who should display the helpText: |
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70 |
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221 | 71 |
by default, the helpListener opens a little popup view, which displays the |
72 |
returned help message. However, a nice trick which can be used by applications |
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is to create an infoLabel as a subview of the topFrame (a la windows) |
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and display the text right in the #helpTextFor: method. To cheat the |
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help listener, this method should then return nil, to keep it silent. |
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[author:] |
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Claus Gittinger |
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233 | 81 |
[start with:] |
82 |
ActiveHelp start |
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ActiveHelp stop |
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221 | 85 |
[See also:] |
233 | 86 |
ActiveHelpView |
87 |
WindowGroup WindowEvent |
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ApplicationModel StandardSystemView |
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100 | 89 |
" |
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! |
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91 |
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92 |
examples |
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93 |
" |
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233 | 94 |
(make certain that activeHelp is turned on ... |
95 |
... otherwise, you will see nothing) |
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100 | 96 |
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97 |
the following example uses a Plug as a model replacement. |
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In concrete application, you would create a method to implement the helpText |
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query message. |
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227 | 100 |
[exBegin] |
101 |
|app top button1 button2| |
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100 | 102 |
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227 | 103 |
app := Plug new. |
104 |
app respondTo:#helpTextFor: |
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with:[:view | |
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view == button1 ifTrue:[ |
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'this is button1' |
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] ifFalse:[ |
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view == button2 ifTrue:[ |
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'some help for button2' |
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] ifFalse:[ |
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nil |
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] |
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] |
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]. |
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100 | 116 |
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227 | 117 |
top := StandardSystemView new. |
118 |
top extent:300@100. |
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button1 := Button label:'b1' in:top. |
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button1 origin:0.0@0.0 corner:0.5@30. |
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button2 := Button label:'b2' in:top. |
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button2 origin:0.5@0.0 corner:1.0@30. |
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top model:app. '<-- normally this would be: top application:app'. |
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top open |
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[exEnd] |
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100 | 126 |
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233 | 127 |
(make certain that activeHelp is turned on ... |
128 |
... otherwise, you will see nothing) |
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||
227 | 130 |
alternatively, display of the helpMessage in a local, private view: |
131 |
[exBegin] |
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|app top button1 button2 infoView| |
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100 | 133 |
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227 | 134 |
app := Plug new. |
135 |
app respondTo:#helpTextFor: |
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with:[:view | infoView label:'info ...'. |
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view == button1 ifTrue:[ |
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138 |
infoView label:'this is button1' |
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]. |
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140 |
view == button2 ifTrue:[ |
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141 |
infoView label:'some help for button2' |
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]. |
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nil |
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]. |
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100 | 145 |
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227 | 146 |
top := StandardSystemView new. |
147 |
top extent:300@100. |
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148 |
button1 := Button label:'b1' in:top. |
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button1 origin:0.0@0.0 corner:0.5@30. |
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button2 := Button label:'b2' in:top. |
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button2 origin:0.5@0.0 corner:1.0@30. |
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infoView := Label label:'info ...' in:top. |
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infoView level:-1; origin:0.0@1.0 corner:1.0@1.0. |
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infoView topInset:(infoView preferredExtent y negated - 3); |
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leftInset:3; |
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rightInset:3; |
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bottomInset:3; |
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adjust:#left. |
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top model:app. '<-- normally this would be: top application:app'. |
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top open |
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[exEnd] |
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59 | 162 |
" |
163 |
! ! |
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164 |
||
338
071f92621e3b
oops - catching the terminateSignal is no good idea
Claus Gittinger <cg@exept.de>
parents:
330
diff
changeset
|
165 |
!ActiveHelp class methodsFor:'initialization'! |
59 | 166 |
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167 |
initialize |
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233 | 168 |
"set default delay & help-display times" |
169 |
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92 | 170 |
ShowTime := 15. |
100 | 171 |
DelayTime := 2. |
92 | 172 |
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173 |
" |
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174 |
ActiveHelp initialize |
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" |
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233 | 176 |
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"Modified: 27.4.1996 / 15:07:27 / cg" |
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59 | 178 |
! ! |
179 |
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338
071f92621e3b
oops - catching the terminateSignal is no good idea
Claus Gittinger <cg@exept.de>
parents:
330
diff
changeset
|
180 |
!ActiveHelp class methodsFor:'startup'! |
100 | 181 |
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233 | 182 |
isActive |
183 |
"return true, if activeHelp is turned on" |
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138 | 185 |
^ TheOneAndOnlyHelpListener notNil |
233 | 186 |
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187 |
"Modified: 27.4.1996 / 15:07:57 / cg" |
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138 | 188 |
! |
59 | 189 |
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190 |
start |
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233 | 191 |
"start activeHelp" |
192 |
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59 | 193 |
TheOneAndOnlyHelpListener isNil ifTrue:[ |
233 | 194 |
TheOneAndOnlyHelpListener := self new. |
59 | 195 |
]. |
196 |
TheOneAndOnlyHelpListener listen |
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197 |
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198 |
" |
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199 |
ActiveHelp start |
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200 |
" |
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233 | 201 |
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202 |
"Modified: 27.4.1996 / 15:08:05 / cg" |
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59 | 203 |
! |
204 |
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205 |
stop |
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233 | 206 |
"stop activeHelp" |
207 |
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59 | 208 |
TheOneAndOnlyHelpListener notNil ifTrue:[ |
233 | 209 |
TheOneAndOnlyHelpListener unlisten. |
59 | 210 |
]. |
92 | 211 |
TheOneAndOnlyHelpListener := nil |
59 | 212 |
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213 |
" |
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214 |
ActiveHelp stop |
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" |
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233 | 216 |
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217 |
"Modified: 27.4.1996 / 15:08:11 / cg" |
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138 | 218 |
! ! |
219 |
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338
071f92621e3b
oops - catching the terminateSignal is no good idea
Claus Gittinger <cg@exept.de>
parents:
330
diff
changeset
|
220 |
!ActiveHelp class methodsFor:'times'! |
138 | 221 |
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222 |
delayTime:numberOfSeconds |
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223 |
"set the delay (the time, the cursor has to be in the view |
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before help is shown). The default is 2 seconds." |
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225 |
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226 |
DelayTime := numberOfSeconds |
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227 |
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228 |
" |
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229 |
ActiveHelp delayTime:0.5 |
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230 |
ActiveHelp delayTime:2 |
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231 |
ActiveHelp delayTime:10 |
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232 |
" |
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59 | 233 |
! |
234 |
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138 | 235 |
showTime:numberOfSeconds |
236 |
"set the number of seconds, a help messages is to be shown. |
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The default is 15 seconds." |
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238 |
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239 |
ShowTime := numberOfSeconds |
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240 |
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241 |
" |
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242 |
ActiveHelp showTime:10 |
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243 |
ActiveHelp showTime:99999 |
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244 |
ActiveHelp showTime:30 |
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245 |
" |
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246 |
! ! |
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247 |
||
248 |
!ActiveHelp methodsFor:'listening'! |
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249 |
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250 |
buttonMotion:state x:x y:y view:view |
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233 | 251 |
"handle motion events - if the mousepointer left the |
252 |
previous helped view, hide the help" |
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253 |
||
138 | 254 |
self hideIfPointerLeft:view. |
255 |
^ false |
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233 | 256 |
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257 |
"Modified: 27.4.1996 / 15:09:48 / cg" |
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138 | 258 |
! |
259 |
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260 |
buttonPress:state x:x y:y view:view |
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233 | 261 |
"handle button press - unconditionally hide the help" |
262 |
||
138 | 263 |
self hideHelp. |
264 |
^ false |
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233 | 265 |
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266 |
"Modified: 27.4.1996 / 15:09:45 / cg" |
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138 | 267 |
! |
268 |
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269 |
keyPress:state x:x y:y view:view |
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233 | 270 |
"handle key press - unconditionally hide the help" |
271 |
||
138 | 272 |
self hideHelp. |
273 |
^ false |
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233 | 274 |
|
275 |
"Modified: 27.4.1996 / 15:09:57 / cg" |
|
138 | 276 |
! |
277 |
||
278 |
pointerEnter:state x:x y:y view:aView |
|
233 | 279 |
"handle pointer entering a view; setup timeOut to show help" |
280 |
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344 | 281 |
|p| |
138 | 282 |
|
283 |
showProcess notNil ifTrue:[ |
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233 | 284 |
p := showProcess. showProcess := nil. |
285 |
p terminate. |
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138 | 286 |
]. |
287 |
self hideIfPointerLeft:aView. |
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288 |
aView topView == currentHelpView ifTrue:[ |
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233 | 289 |
^ true |
138 | 290 |
]. |
291 |
||
292 |
self initiateHelpFor:aView atX:x y:y. |
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293 |
^ false |
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233 | 294 |
|
295 |
"Modified: 27.4.1996 / 15:10:27 / cg" |
|
138 | 296 |
! |
297 |
||
298 |
pointerLeave:state view:view |
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233 | 299 |
"handle pointer leaving a view; hide help text" |
300 |
||
138 | 301 |
self hideIfPointerLeft:view. |
302 |
^ false |
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233 | 303 |
|
304 |
"Modified: 27.4.1996 / 15:10:41 / cg" |
|
59 | 305 |
! ! |
306 |
||
307 |
!ActiveHelp methodsFor:'private'! |
|
308 |
||
309 |
helpTextFor:aView atX:x y:y |
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233 | 310 |
"retrieve helptext for aView as a string; |
100 | 311 |
walk along the views superView chain, |
312 |
asking models and views encountered while walking. |
|
313 |
The first one who understands and returns a nonNil answer to the |
|
233 | 314 |
#helpTextFor:at: or #helpTextFor: message ends this search and the |
100 | 315 |
returned string is returned." |
316 |
||
602 | 317 |
|model app text view v sv| |
59 | 318 |
|
319 |
view := aView. |
|
320 |
(model := aView model) notNil ifTrue:[ |
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233 | 321 |
(model respondsTo:#helpTextFor:at:) ifTrue:[ |
322 |
text := model helpTextFor:aView at:x@y. |
|
323 |
text notNil ifTrue:[^ text]. |
|
324 |
]. |
|
325 |
(model respondsTo:#helpTextFor:) ifTrue:[ |
|
326 |
text := model helpTextFor:aView. |
|
327 |
text notNil ifTrue:[^ text]. |
|
328 |
] |
|
59 | 329 |
]. |
330 |
||
331 |
(aView respondsTo:#helpText) ifTrue:[ |
|
233 | 332 |
text := aView helpText. |
333 |
text notNil ifTrue:[^ text]. |
|
59 | 334 |
]. |
335 |
||
336 |
"walk up the chain - maybe someone knows about its subview ..." |
|
337 |
v := aView. |
|
338 |
||
296 | 339 |
[(sv := v container) notNil] whileTrue:[ |
233 | 340 |
(model := sv model) notNil ifTrue:[ |
341 |
(model respondsTo:#helpTextFor:at:) ifTrue:[ |
|
342 |
text := model helpTextFor:aView at:x@y. |
|
343 |
text notNil ifTrue:[^ text]. |
|
344 |
]. |
|
345 |
(model respondsTo:#helpTextFor:) ifTrue:[ |
|
346 |
text := model helpTextFor:aView. |
|
347 |
text notNil ifTrue:[^ text]. |
|
348 |
] |
|
349 |
]. |
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59 | 350 |
|
233 | 351 |
(sv respondsTo:#helpTextFor:) ifTrue:[ |
352 |
text := sv helpTextFor:aView. |
|
353 |
text notNil ifTrue:[^ text]. |
|
354 |
text := sv helpTextFor:v. |
|
355 |
text notNil ifTrue:[^ text]. |
|
356 |
]. |
|
602 | 357 |
|
233 | 358 |
v := sv. |
59 | 359 |
]. |
360 |
||
602 | 361 |
(aView respondsTo:#application) ifTrue:[ |
362 |
(app := aView application) notNil ifTrue:[ |
|
363 |
(app respondsTo:#helpTextFor:at:) ifTrue:[ |
|
364 |
text := app helpTextFor:aView at:x@y. |
|
365 |
text notNil ifTrue:[^ text]. |
|
366 |
]. |
|
367 |
(app respondsTo:#helpTextFor:) ifTrue:[ |
|
368 |
text := app helpTextFor:aView. |
|
369 |
text notNil ifTrue:[^ text]. |
|
370 |
] |
|
371 |
] |
|
372 |
]. |
|
373 |
||
100 | 374 |
(v notNil and:[v respondsTo:#application]) ifTrue:[ |
602 | 375 |
(app := v application) notNil ifTrue:[ |
376 |
(app respondsTo:#helpTextFor:at:) ifTrue:[ |
|
377 |
text := app helpTextFor:aView at:x@y. |
|
233 | 378 |
text notNil ifTrue:[^ text]. |
379 |
]. |
|
602 | 380 |
(app respondsTo:#helpTextFor:) ifTrue:[ |
381 |
text := app helpTextFor:aView. |
|
233 | 382 |
text notNil ifTrue:[^ text]. |
383 |
] |
|
384 |
] |
|
100 | 385 |
]. |
386 |
(v notNil and:[v respondsTo:#model]) ifTrue:[ |
|
233 | 387 |
(model := v model) notNil ifTrue:[ |
388 |
(model respondsTo:#helpTextFor:at:) ifTrue:[ |
|
389 |
text := model helpTextFor:aView at:x@y. |
|
390 |
text notNil ifTrue:[^ text]. |
|
391 |
]. |
|
392 |
(model respondsTo:#helpTextFor:) ifTrue:[ |
|
393 |
text := model helpTextFor:aView. |
|
394 |
text notNil ifTrue:[^ text]. |
|
395 |
] |
|
396 |
] |
|
100 | 397 |
]. |
398 |
||
59 | 399 |
(view class respondsTo:#helpText) ifTrue:[ |
233 | 400 |
text := view class helpText. |
401 |
text notNil ifTrue:[^ text]. |
|
59 | 402 |
]. |
403 |
||
404 |
^ nil |
|
100 | 405 |
|
406 |
"Modified: 31.8.1995 / 20:38:00 / claus" |
|
296 | 407 |
"Modified: 5.6.1996 / 14:18:23 / cg" |
100 | 408 |
! |
409 |
||
138 | 410 |
hideIfPointerLeft:aView |
233 | 411 |
"hide help, if the pointer is not in aView" |
412 |
||
138 | 413 |
|whereOnScreen p| |
414 |
||
415 |
"/ showProcess notNil ifTrue:[ |
|
416 |
"/ p := showProcess. showProcess := nil. |
|
417 |
"/ p terminate. |
|
418 |
"/ ]. |
|
419 |
||
276 | 420 |
whereOnScreen := aView graphicsDevice pointerPosition. |
138 | 421 |
|
422 |
(currentFrame notNil |
|
423 |
and:[(currentFrame insetBy:1@1) containsPoint:whereOnScreen]) ifFalse:[ |
|
233 | 424 |
self hideHelp. |
425 |
currentView := nil |
|
138 | 426 |
]. |
233 | 427 |
|
276 | 428 |
"Modified: 28.5.1996 / 20:18:28 / cg" |
138 | 429 |
! |
430 |
||
100 | 431 |
initiateHelpFor:aView atX:x y:y |
233 | 432 |
"start a timeout process to display help for aView after some delay" |
433 |
||
100 | 434 |
|text p| |
435 |
||
436 |
text := self helpTextFor:aView atX:x y:y. |
|
437 |
||
438 |
text notNil ifTrue:[ |
|
233 | 439 |
DelayTime > 0 ifTrue:[ |
440 |
showProcess notNil ifTrue:[ |
|
441 |
p := showProcess. showProcess := nil. |
|
442 |
p terminate. |
|
443 |
]. |
|
444 |
showProcess := [ |
|
297 | 445 |
Delay waitForSeconds:DelayTime. |
233 | 446 |
showProcess := nil. |
447 |
self showHelp:text for:aView |
|
448 |
] forkAt:(Processor userSchedulingPriority + 1). |
|
449 |
] ifFalse:[ |
|
450 |
self showHelp:text for:aView |
|
451 |
] |
|
100 | 452 |
]. |
233 | 453 |
|
297 | 454 |
"Modified: 7.6.1996 / 10:02:19 / cg" |
59 | 455 |
! ! |
456 |
||
457 |
!ActiveHelp methodsFor:'show / hide help'! |
|
458 |
||
459 |
hideHelp |
|
233 | 460 |
"hide the help text" |
461 |
||
98 | 462 |
|p| |
463 |
||
92 | 464 |
showProcess notNil ifTrue:[ |
233 | 465 |
p := showProcess. showProcess := nil. |
466 |
p terminate. |
|
92 | 467 |
]. |
59 | 468 |
currentHelpView notNil ifTrue:[ |
233 | 469 |
[ |
470 |
currentHelpView destroy. |
|
471 |
currentHelpView := nil. |
|
472 |
currentView := nil. |
|
473 |
] valueUninterruptably |
|
59 | 474 |
]. |
475 |
currentFrame := nil. |
|
476 |
closeProcess notNil ifTrue:[ |
|
233 | 477 |
p := closeProcess. closeProcess := nil. |
478 |
p terminate. |
|
59 | 479 |
] |
233 | 480 |
|
481 |
"Modified: 27.4.1996 / 15:12:13 / cg" |
|
59 | 482 |
! |
483 |
||
484 |
showHelp:aHelpText for:view |
|
233 | 485 |
"show the help text for aView" |
486 |
||
596 | 487 |
|org p v dev top app| |
59 | 488 |
|
489 |
view == currentView ifTrue:[^ self]. |
|
490 |
||
596 | 491 |
"/ give the views application a chance |
492 |
"/ to decide where to show the help text |
|
493 |
"/ (i.e. in its own information area) |
|
494 |
||
495 |
top := view topView. |
|
602 | 496 |
|
497 |
(app := view application) notNil ifTrue:[ |
|
596 | 498 |
(app showHelp:aHelpText for:view) ifTrue:[ |
499 |
^ self |
|
500 |
] |
|
501 |
]. |
|
502 |
||
92 | 503 |
closeProcess notNil ifTrue:[ |
233 | 504 |
p := closeProcess. closeProcess := nil. |
505 |
p terminate. |
|
92 | 506 |
]. |
59 | 507 |
currentHelpView notNil ifTrue:[ |
233 | 508 |
self hideHelp |
59 | 509 |
]. |
510 |
||
511 |
org := view originRelativeTo:nil. |
|
512 |
currentFrame := org extent:view extent. |
|
513 |
org :=org + (view extent // 2). |
|
514 |
||
100 | 515 |
v := ActiveHelpView for:aHelpText withCRs. |
59 | 516 |
|
276 | 517 |
dev := view graphicsDevice. |
518 |
org := dev pointerPosition. |
|
100 | 519 |
org := org + (10@10). |
276 | 520 |
(org x + v width) > dev width ifTrue:[ |
233 | 521 |
org := (org x - v width) @ org y |
92 | 522 |
]. |
276 | 523 |
(org y + v height) > dev height ifTrue:[ |
233 | 524 |
org := org x @ (org y - v height). |
92 | 525 |
]. |
526 |
||
100 | 527 |
v origin:org. |
59 | 528 |
"/ currentHelpView open. |
100 | 529 |
v realize. |
530 |
v enableButtonMotionEvents. |
|
531 |
v enableMotionEvents. |
|
532 |
currentHelpView := v. |
|
59 | 533 |
|
534 |
currentView := view. |
|
535 |
closeProcess := [ |
|
338
071f92621e3b
oops - catching the terminateSignal is no good idea
Claus Gittinger <cg@exept.de>
parents:
330
diff
changeset
|
536 |
[ |
233 | 537 |
(Delay forSeconds:ShowTime) wait. |
538 |
[ |
|
539 |
currentHelpView notNil ifTrue:[ |
|
540 |
currentHelpView destroy. |
|
541 |
currentHelpView := nil. |
|
542 |
] |
|
543 |
] valueUninterruptably |
|
338
071f92621e3b
oops - catching the terminateSignal is no good idea
Claus Gittinger <cg@exept.de>
parents:
330
diff
changeset
|
544 |
] valueOnUnwindDo:[ |
071f92621e3b
oops - catching the terminateSignal is no good idea
Claus Gittinger <cg@exept.de>
parents:
330
diff
changeset
|
545 |
closeProcess := nil. |
233 | 546 |
]. |
59 | 547 |
] forkAt:(Processor userSchedulingPriority + 1). |
100 | 548 |
|
549 |
"Modified: 31.8.1995 / 19:20:45 / claus" |
|
338
071f92621e3b
oops - catching the terminateSignal is no good idea
Claus Gittinger <cg@exept.de>
parents:
330
diff
changeset
|
550 |
"Modified: 16.10.1996 / 00:36:22 / cg" |
59 | 551 |
! ! |
552 |
||
338
071f92621e3b
oops - catching the terminateSignal is no good idea
Claus Gittinger <cg@exept.de>
parents:
330
diff
changeset
|
553 |
!ActiveHelp class methodsFor:'documentation'! |
138 | 554 |
|
555 |
version |
|
602 | 556 |
^ '$Header: /cvs/stx/stx/libview2/ActiveHelp.st,v 1.20 1997-06-16 16:58:43 ca Exp $' |
138 | 557 |
! ! |
59 | 558 |
ActiveHelp initialize! |