D17626: [WIP] Print preview for KmPlot

[Yuri Chornoivan]

yurchor created this revision.
yurchor added a reviewer: KDE Edu.
Herald added a project: KDE Edu.
Herald added a subscriber: kde-edu.
yurchor requested review of this revision.

REVISION SUMMARY
  A bit ugly attempt to implement print preview with an additional configuration widget.
  
  F6480632: print_prev.png <https://phabricator.kde.org/F6480632>

TEST PLAN
  1. Plot something.
  2. Choose "File -> Print Preview"
  3. Press the last button on the toolbar to configure the print options.
  4. Due to the obvious inability to repaint the image from the current code, no print preview update occurs after pressing the "Ok" button.
  5. Choose some other option (switch to the landscape mode and back). The preview should be updated with the parameters chosen on step 3.
  
  I need an advice on the quality of the code and how the update can be triggered in the right way (google only advices to trigger it in a programmatical way of pressing buttons on the toolbar that is surely unacceptable).
  
  Many thanks in advance for your reviews.

REPOSITORY
  R334 KmPlot

REVISION DETAIL
  https://phabricator.kde.org/D17626

AFFECTED FILES
  kmplot/kmplot_part.rc
  kmplot/maindlg.cpp
  kmplot/maindlg.h

To: yurchor, #kde_edu
Cc: kde-edu, narvaez, apol
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