Re: show/hide widgets

[Christopher Leopold <leopold in tum de>]

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I use the GTK runtime 2.4.9

The codesample is a bit complicated, 'cause it's part of a much bigger
program.

I tried to reduce it down to the interesting parts of the code ...

First comes the beginning point. It's cycle-method is called from
somewhere else once each turn. Beneath comes the intersting part of the
code. There, the label and the slider are created.

******************

GtkWidget* additionalBox;

int Initialize () {

~  // load the init and cycle functions from the subGUI modules with
~  // dlopen
~  // ...

~  // initialize the additional box (so everybody can draw there from
~  // now on)

~  g_type_init();
~  additionalBox = gtk_vbox_new(TRUE, 0);

~  // call the initialize functions of all subGUI modules
~  // ...
~  pictureOrGraph[i] = initializeFunctions[i](checkboxLabel[i]);

~  // initzialze things for the gui thread
~  pthread_t guiThreadID;
~  int* arg;
~  pthread_mutex_init(&drawing, NULL);

~  pthread_create(&guiThreadID, NULL, initGUI, arg);
~  pthread_detach(guiThreadID);

~  return MRC_SUCCESS;
}

int Cycle () {
~  pthread_mutex_lock(&drawing);

~  cycleFunctions[i](picturePixmap, toBeDrawn[i], color, -1);

~  pthread_mutex_unlock(&drawing);

~  return MRC_SUCCESS;
}

/*
~ * The GUI thread
~ */
void* initGUI(void* arg) {
~  int i;
~  GtkWidget* window;
~  GtkWidget* table;
~  //GtkWidget* additionalBox;  defined global

~  gtk_init(NULL, NULL);

~  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
~  // click on the X in the upper right corner kills the window
~  // ...

~  // create table with 2x3 fields, not the same size
~  table = gtk_table_new(2, 3, FALSE);
~  gtk_container_add(GTK_CONTAINER(window), table);

~  // add the additional box on top and with the full width
~  gtk_widget_show(additionalBox);
~  gtk_table_attach_defaults(GTK_TABLE(table), additionalBox, 0,2,0,1);

~  gtk_widget_show(table);
~  gtk_widget_show(window);

~  while(showWindow) {
~    pthread_mutex_lock(&drawing);
~    if(showWindow) {
~      gtk_main_iteration_do(FALSE);
~    }
~    pthread_mutex_unlock(&drawing);
~    usleep(10000);
~  }
~  return 0;
}//initGUI


GtkWidget* getAdditionalBox() {
~  return additionalBox;
}

******************

// boxe for the slider and its label
GtkWidget* box;
// adjustment of the slider
GtkObject* timeAdjustment;

int GUI_Initialize(char* label) {
~  // ...

~  // set label and slider
~  box = gtk_hbox_new(FALSE, 0);

~  GtkWidget* sliderLabel = gtk_label_new("Time Slider");
~  gtk_widget_show(sliderLabel);
~  gtk_box_pack_start(GTK_BOX(box), sliderLabel, FALSE, TRUE, 2);

~  timeAdjustment = gtk_adjustment_new(0.0, 0.0, hdf5LogfileSize,
~           (hdf5LogfileSize / 1000.0), (hdf5LogfileSize / 150.0), 0.0);
~  g_signal_connect(G_OBJECT(timeAdjustment), "value_changed",
~            G_CALLBACK(setCycleCount), NULL);
~  GtkWidget* timeSlider =
~            gtk_hscale_new(GTK_ADJUSTMENT(timeAdjustment));
~  gtk_scale_set_draw_value(GTK_SCALE(timeSlider), FALSE);
~  gtk_range_set_update_policy(GTK_RANGE(timeSlider),
~            GTK_UPDATE_DISCONTINUOUS);
~  gtk_widget_show(timeSlider);
~  gtk_box_pack_start(GTK_BOX(box), timeSlider, TRUE, TRUE, 2);

~  //*** I don't want to show the box here ***//
~  gtk_widget_show(box);
~  gtk_box_pack_start(GTK_BOX(getAdditionalBox()), box, TRUE, TRUE, 0);

~  return GUI_PICTURE_WINDOW;
}

void GUI_Cycle(GdkPixmap* pixmap, int toBeDrawn, ....) {
~  if (timeSliderValue + 1 == ++GTK_ADJUSTMENT(timeAdjustment)->value) {
~    gtk_adjustment_value_changed(GTK_ADJUSTMENT(timeAdjustment));
~  }

~  printf("cycleTime %i\n", cycleCount);

~  if (toBeDrawn) {
~    // draw the slider and label
~    if (!boxDrawn) {
~      //*** I want to show the box here ***//
~      //gtk_widget_show_now(box);
~      boxDrawn = 1;
~    }
~  }
~  else {
~    // hide the slider and label
~    if (boxDrawn) {
~      //*** I want to hide the box here ***//
~      //gtk_widget_hide(box);
~      boxDrawn = 0;
~    }
~  }
}

void setCycleCount(GtkAdjustment* adj) {
~  // ...
}
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